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EZ Mike is saying that Coupe and Convertible side glass is different. It's in the rear angle of the glass. The vert is a lot steeper. I would also say 68 coupe would be different than 69 and up.
What Easy Mike and that corvette guy are saying is correct the shape of the glass between the coupe and convertible is different.
Now lets have some fun....68-75 glass vert or coupe said Astro Ventilation 76- up did not. The later years also had glass that was thinner I believe starting in 80 but not sure on that.
68 is a funky year so I would bet that the glass is a year specific for them.
Astro Ventilation was not an 'option'; it was a marketing tool...meant to justify the elimination of the side vent windows. Early C3 model years had that painted in script on the side windows. Non-AC cars had functional vent doors in the louvered areas behind the rear window; A/C cars had block-off plates and those were just water collectors and drains directed to the rear wheel wells.
Last edited by 7T1vette; May 19, 2020 at 12:49 AM.