Correct me if I am wrong but a MkIV Jetta rear disk brake caliper, has the equivalent pad size and pistons essentially has those same features, including the mechanical e-brake and they fit an empi rear disk, rotohub is what they call it.
You can choose whichever bolt pattern that you desire.
My desire was to get the hub centric benefit of the 944 axles and with ROtohubs sometimes you need spacers and you don't get it.
Anyway, that is how I got started on the 944 rabbit trail.