Mark, I think your calipers were better items than my Wilwoods. Even Rally Design say that to match a stock S2 RST caliper you need a 4 pot caliper with 1.75" pistons ideally ; mine were 1.37", well below S2 caliper, but possibly better than an S1 item (which is what my car is). With my car being an S2 the wheelarch trims go quite a way into the wheelarches. With Hi-Specs and different wheels I may considered it, but I do like to keep the look of my car original and not think about speed bumps etc. and potentially avoid destroying tyres.
Anyway, after some massaging they are fitted with TRW pads, albeit of the 60.5mm width, and not the more usual 58.2mm. One thing is for sure ; the braking has improved immensely. I can now brake very late into corners. However, I may have to think about what to do with the rear of the car! I can see why the TVR Chimaera guys love this setup for a budget system. Braking from 80 brings this car to a very swift halt, something I would have been saying a silent prayer for with the Wilwoods!