I`ve been searching the internet for the little rubber inserts that go into the T-Tops, but cant find any. I`m not sure how to describe it, other than it is the small rubber piece that slides into the steel holder on the car itself. There are 2 of them on each T-top. If anyone can help me out, I would appreciate it. They are for a '74 Z28 Type LT if it matters.

welcome.
the problem with the early T-top cars is that they used a few different parts suppliers over the years. in fact, the t-tops were installed by outside companies after the car was built. finding parts can be a pain, but would be easier if you knew what brand of tops you had.

74 is all aftermarket - not GM. Factory appeared in 78. Try poking around nastyz28.com

Ebay ;)