Todd, I don't have TFA handy, but the RS2 & UrS share the same MC (24mm I believe). So. 993tt front and rear calipers shouldn't be a problem, given that the RS2 was specified with 993tt fornts (optionally) and 968 CS rears. Anyway, one of my next projects is getting the 993tt rears on their (thanks Joearn!). Frank at s-cars.org