For '85 there are two types of rear hatch glass, those with a defogger, and those without.

Now, it would seem that all C4 rear hatch glass would work on any years. But, there might be a difference in connectors for the defogger for later models. I think the mounts for the struts are the same...

Enjoy this thread, and hopefully someone will chime in with what they've learned....

http://www.digitalcorvettes.com/forums/showthread.php?s=&threadid=13894&

 

Thanks for the post. I though that was the case.