Fiat / Alfa - originally Silver on 20V Turbo Coupe - Red on Alfa 147 - GTV etc - 325mm x 28mm max disc size
Fixing bolts are at 130mm centres - thread M12 x 1.75
fluid inlet is central between pistons with M10 x 1 taper seat
Stainless pad shims with M6 screws pistons are 38mm and 42mm
BMW E38 - 7 series - originaly Black with no logo
355mm x 28mm max disc size but can be spaced to 32mm thick
Fiat on Left - E38 on Right
E38 Fixing bolts are at 112mm centres - threaded M12 x 1.5
fluid inlet is central between pistons angled up with M10 x 1 taper seat
No pad shims
pistons are 40mm and 44mm - standard are alloy - these are Stainless replacements
Peugeot 406 - originally Black
325mm x 28mm max disc size
Fixing bolts are at 82mm centres - 12mm clearance holes with an odd off-set which makes them difficult to use straight fit on many Peugeot models
fluid inlet is central between pistons with M10 x 1 taper seat
Stainless pad shims with M6 screws pistons are 38mm and 42mm
Fiat Left - E38 Right
Note that the Fiat caliper is symmetrical & will run either way up - the E38 can be run up side down in front of the the axle but it makes for interesting pipework
Alfa 166 - 150mm fixing centres with M12 x 1.5 thread
Pistons are 38mm and 42mm
Fluid inlet M10 x 1 with a taper seat again, designed to fit forward of the axle
Evo - all up to 9
Max disc size - 325mm x 32mm
They're big and clumsy - on the whole not too useful
Pistons are 40mm and 46mm
fixing centres are 158mm with M12 x 1.75 thread
Fluid inlet is M10 x 1 banjo bolt only
Peugeot 607 - 807 and others - Fixing centres 100mm with M12 x 1.5 thread
Max disc size 325mm x 32mm
As you can see, the fluid inlet means it only fits well in front of the axle - it's M10 x 1 with a taper seat
Pistons are 38mm and 42mm and shorter than the more common calipers
Maserati - these are the all alloy type - not to be confused with the iron / alloy type borrowed from Mercedes
symmetrical so easily fitted in front or behind the axle
Fixing bolts are at 110mm centres - 12mm clearance holes
fluid inlet is central between pistons with M10 x 1 taper seat
Stainless pad shims with M6 screws pistons are 38mm and 46mm
Will run a 32mm thick disc up to 355mm max
Original Ford Focus RS
lower - upper is more common Fiat
Note the handed fluid inlet port.
Banjo fitting only as the hole goes straight through to the piston
You can see that the pads are the same shape as the Fiat caliper.
The stainless shims are the same too.
Note also, the casting shape to suit a larger disc - Fiat is 325mm max - 350mm is possible with the Focus RS
You can see here that the casting is larger and the bolts that hold the two halves together are further apart
Fixing holes are also M12 x 1.75 and at 130mm centres