Thanks for the responses. I ended up making my own and using a bit of black silicone caulking... I don't think water will be leaking in that way for a loooong time.

BUT, it turns out I was only half correct. Water WAS getting in due to the bad gaskets, but it's getting in somewhere else too. I haven't figured out precisely where, but it's definitely somewhere near the right tail light area. I intend to check the sunroof drain/hose/tube as I've heard this is a problem in older ludes.

Thankfully I found the drain plugs in the trunk for the time being

Thanks again