It sounds like you have the next generation of track and car, which is Antal. My track is 1 1/4" high, which is different than yours. I finally managed to match my track and car after extensive internet searching, and it is Lewmar Solent size 2. Lewmar made this product from 85 to 91, and the SN and Sm's to somewhere near my hull number have this setup. There are absolutely no spares available worldwide, and nothing else is going to fit this track.
I found an older Maramu in this marina yesterday, and they did tap a new Harken traveller system on top of the existing track. While not beautiful, it seems to work OK, and I'll consider this option. It also raises the system up high enough that you can remove the car for maintenance.
Thanks again for your help.