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Try any of the corvette catalog stores but kinda strange your saying neither one pop up, might be something electrical stopping the function from happening.
The the motors make noise when you activate them? If not, I'd go fuse hunting.
It's pretty common for the main gears to strip out on the motors as someone else already stated, C&S has a good rebuild kit, https://www.corvettepartscenter.com/...or-rebuild-kit
Make sure any rebuild kit you get, has the T-Braces. The factory motor housings are a poor design, the T-Brace stiffens them up and prevents them from having problems in the future.
Good R&R video here