I think I'm kind of figuring it out, if you look at this ebay listing: https://www.ebay.com/itm/205826403900 and compare the circled parts here: https://imgur.com/a/JU6x6Ln I think that's what I'm looking for. If anyone knows off the top of their head what that's called or a link to find one, I'd be appreciative, otherwise I may just buy that seat as a donor. All the seat rail's I'm finding are just the silver parts that run on the track, not really the frame part.

Thanks again!