Literally a rectangular block with 4 holes in is all you need. Could fit any radial mounted callipers with those discs very simply. I'll see if I can get some pics off him.
We had been wondering for years what discs they were as they were direct fit. until last year I rebuilt and put a new engine in the car for the guy who now owns it and realised they were 406 305x28mm discs.
Means you can buy new discs for £50 if you wanted instead of 3-400 for rotors.
Black power baby! SUUUUUPERCHARGED
Seat Leon FR TDI 190BHP 300lbft daily gti-6 killer :p
12x 306's owned so far
Cambelts, clutches, service work carried out on All makes and models, Peugeot Citroen / mitsubishi specialist.
Pug planet / Citroen Lexia diagnostics / code reads available.