OK OK I get the bone head award, I don't type as fast as I think. Would this pillow take away the possibility of damage where the rear window is seamed to the top? This is the 1st conv. I have ever owned and just want to know more about the do's and don'ts to protect the top.
I appreciate your patience with my dumb questions.
Not dumb questions at all. Questions are how we all learn..!

And there are a
lot of useless products out there, so it's good to check with others for opinions and recommendations!
Without seeing the placement of this pillow thing, it's difficult for me to say whether it will prevent damage, cause damage, or just siphon money out of your wallet without really doing anything more than giving you a 'warm, fuzzy' feeling that you did something to protect your convertible top/rear window...Can you provide a link to the vendor's product...?
I'm thinking that if the 'pillow' is intended to be sandwiched between the window and the folded top material, it could potentially cause more harm than prevent it (through the introduction of an unwanted stress point, where something relatively thicker than the available gap is pressing on a point that wasn't designed to be pressed on). I don't know about your top, but mine fits pretty tightly inside the storage cavity when I put it down. If the 'pillow' is laid underneath the window (between the rear deck and the bottom of the folded top), I can't see how that would really be any more protective/supportive (from a damage-prevention standpoint) than the existing frame of the folded top...? And if you
really needed something soft and supportive there, you could probably just use a standard bed pillow and save yourself the 'Corvette tax...'
Again, the folding top on the C5 convertible is a pretty ingenious contraption. I do seem to recall reading about some folks here on the forum having their rear windows come loose from the top material (you'll have to search for the thread), but they were easily repaired. However, I did not get the impression from that thread that anyone thought the repair could have been avoided through the use of some kind of additional protection/support. But stranger things have happened...