In case anyone is planning on a similar Carbotech path. For the ATE disk brakes (ie not the 230s, IIRC) you need:
CT45s for the front ($122 set 4 pads)
CT31s for the rear. ($119 - " - ))
The prices are for the suffix 1521 which is the "street" set. I figured hi performance and autocross were a little more than I need.
Mike Puskar at Carbotech has been very helpful (as has naj, as ever, this time with dimensions and Ferrodo parts which has helped Mike get the exact pads/shoes). I'll let you know how the fitting goes, and what the results are.