Well, this is interesting...
I got the quote for seat tracks from https://www.vintagespeedsters.com/parts/
and then Wolfgang sent me this
The email I recieved from vintagespeedsters is signed "Vintage Motorcar"
Are there 2 companies named Vintage ?
Greg Leach @VSpyder is Vintage Motorcar(s) with an (S) and the guy that bought Kirk's business, fired everyone, moved the business to Arizona, ruined the business, and sold it to someone else is named Vintage Speedsters but the parent company was called Vintage Motorcar without the (S).
It's confusing I know. But if I were you I'd buy from Greg at Vintage Motorcars because he's done a lot for this hobby.