The T-top cars came with original T-top bags that were manufactured by various companies. They were made to protect the finish of the T-tops while they were removed from the T-top center bar. There were two different kinds of T-top bags issued throughout the 1968-1982 Corvettes.
The first design use the hook & loop fastener design, also known as the Velcro design (see Fig. 1). We’ve seen two different styles of the opening. One is with the opening on top, where you slide the T-top down vertically. Another style is an opening from the side, where half the T-top would slide horizontally into a pocket, and the other side of the bag would flap over. These T-top bags were used from 1968 up to Early 1969.
The second design uses a snap-button design. Three “tops” were spread across the flap that would close on a set of three lower receivers, securing the T-top inside the storage bag. Since the bags were made of very thin vinyl, these snaps usually tore through the material when the snaps were pulled off the receivers. This style of storage bag also allowed the removable roof panel to slide in from the side. This style was used from Late 1969 all the way to the end of production of the C3 Corvettes in 1982.
When finding a replacement door glass for your C3 Corvette, there are a few things you'll want to consider before settling on a piece. It an arduous process to remove the actual glass from your door, so hopefully this guide will help you pick the right piece of glass before you dig into your door.
There are a few variances found in the shape of the glass, color of glass from the factory, and etchings found on the glass depending on your year and model of Corvette.
Coupe or Convertible?
First, you will want to make sure you have the right shape glass for your C3. The Corvette Coupe (option code Y37) was made for the full run of C3's (1968-1982), but from 1968-1975, Chevrolet released Convertible model Corvettes (option code Y67). The glass used for Convertibles (soft top and hard top) is shaped differently on the rear edge to accommodate the shape of the soft tops & hard tops. The angle cuts forward a bit and is not as square at the rear upper corner. Please refer to the picture below:
Here, you can see the rear edge of the glass is shaped differently between the two.
The glass for Late '69-1982 is very similar. From 1968-1974, factory glass came with an "AstroVENTILATION" logo towards the front of the glass. This is the main difference to note between early C3 and late C3 glass.
Again, the late C3 glass (1975 and later) do not feature this AstroVENTILATION logo. You can also determine what year the glass is from by reading the date code located at the rear of the glass, just above the door visibility line. Refer to the picture below for the locations of these two details on the glass:
"LOF" is the original manufacturer of door glass, and is "Soft-Ray/Flo-Lite" glass. The "AS-2" you see is the American Standard specification rating code for side door/vent and coupe rear glass (windshields wil show "AS-1").
The date code is the pair of letter at the right of these details. The first letter will indicate the month, and the second letter indicated the year. For this particular piece of glass pictured above, the date code reads "YJ" (October 1978). Refer below for the breakdown of months and years by letter:
OEM or Aftermarket?
While aftermarket glass come at a reasonable price, some replacement glass is not made to the same specification as OEM door glass.
Around 1980, LOF glass decreased in thickness (from the original 1/4" thickeness to around 1/8"). While looking at some replacement glass (Solex, etc), the actual thickeness of the glass is different, following this change for the late C3's.
The replacement glass measures just over 1/8" thick, while the original LOF glass is just about 1/4" thick! Keep this in mind as you shop for your replacement door glass for your pre-1980 Corvette.
We hope this guide to door glass comes as a help while shopping for replacement windows for your Corvette. Whether you have a Coupe or Convertible, getting the glass replaced is a project that will take time and patience. Hopefully this will prevent you from replacing an incorrect window with a correct piece!
The 1968 Corvette used the AM/FM Push Button receiver with Unit No.* 987453 for the small block 327, while the Unit No. 987464 for the big block 427.1 While the AC Delco Parts sticker might have peeled off from 40+ years of wear and tear, a 1968 Corvette Radio can still be distinguishable by the word “Stereo” in cursive or script writing (if Stereo equipped).2 It is also noted that the lettering on the front face of the radio lights up in green.
The 1969 also had its own radio unit, with part number 993642.3 While this AM/FM unit also read “stereo” on the front face, it was written in capital and block lettering. The 1969 also retained the green backlight to the lettering.2
The 1970-1971 came out with two different part numbers for the radio units. One was equipped with stereo (PN 7303211), and one was not (PN 7302721).4 Both radios had the script “Delco” on the front in script writing. The stereo unit, upon receiving FM stereo, will light up the capital, blocked “STEREO” lettering. The 1970-1971 units were the last years to have green backlight as well.5 One thing to note also; in order to distinguish the 1970-1971 mono radio from the 1972-1973 is on the latter one, there is a circular cut out that exposes the capacitor (see Image 1.1).
The 1972-1973 Radio for the Corvette was the first one to come out with white-backlit lettering. It is also in the same radio where AC Delco changed out the word “STEREO” to a bright orange glowing dot on the right upper corner of the face, to show stereo reception.5 This radio uses part number uses 7937581, while the mono uses part number 7937571. Lastly, AC Delco started manufacturing 72-73 with the circular cut out on the back that exposes the capacitor (see Images 1.1 – 1.4). On June of 1973, the part no. 7937581 (Stereo) ceased in production and was replaced by part number 9341341.6
The 1974 Corvette had a one-year production of the AM/FM Stereo unit with part number 9341341. Because of its one-year-only production, it is considered rare. Production of this unit ceased on October 1974.7 The mono AM/FM receiver (PN 7937571), on the other hand, was used until 19748 and is found to be common.
As the first production of the 1975 Corvette began in October 1974,9 so did the production of its stereo radio unit with part number 934661.7 This part number was used all the way to the 1976 Corvettes. The mono radio for the 1975-1976 uses the part number 9344651.10
1977 was the first year for using the generic Delco line of radios. Three units were offered, an AM/FM mono, an AM/FM Stereo and an AM/FM Stereo 8-track. For the 1977 year, all push buttons were black plastic. The 1977 8-track unit did not have a tape eject button. In 1978 the push buttons were chrome and the 5th button over was also the eject button for the tape.
Also, 77 used earlier style connectors and in 1978, connectors changed.
1977 AM/FM Mono Model # 70HFP1
1977 AM/FM Stereo Model # 70HFM1
1977 AM/FM 8-Track Model # 70HFMT1
Part # for AM/FM 8-Track is 70HFMT1 - 4898160
Part # for AM/FM Mono is 70HFP1 - 9345270
Part # for AM/FM Stereo is 70HFM1 – 7897770
AM/FM Stereo used P/N 789849011
AM/FM Mono uses P/N 1600180112
AM/FM Stereo uses P/N 16009461
*Unit No. and Part No. used interchangeably in the Chevy Radio Parts Catalog