Yeah, I have used HiSpec R132 (I think that's what they are called) 4 pot calipers under Sharktooth wheels using standard brake discs, and I now have an AP kit which I've just fitted. Martin at Reyland was pricing up an AP kit for me as I was thinking of buying one new but it was coming out at around £1800 I think.
The Hispec were a good budget option but not good on the race track - hence the move to AP.
Picture of the Hispecs under 15"s:
https://passionford.com/forum/ford-s...pictorial.html
Charlie