I've got ya, can't you slide your standard caliper out to its fullest extent without the pads fitted and trial fit your wheel to obtain the clearance measurement?
The thing is these calipers run quite close to the standard alloy wheels and the clearance will obviously vary dramatically depending on wheel choice.
On that hispec diagram it illustrates there been 17mm from the outer wheel mounting face of the disc to the inner face of the wheel, what wheels is this for? What size and ET have they used as their test rig for their 4 pot calipers?
I reckon this is going to be a case of buying the calipers ( do they utilise the standard discs?) and bolting them on to see what you've got then possibly spacing the wheels out to suit.
Thats a good idea that I didn't think of. I don't know what they have used to get these measurements
It's a kit, you get caliper, carrier, disc, pads, lines, fluid. This is the thing I can't space my wheels out any more than what they are. I would like to bring them in a bit more.
the link you posted is for 280mm discs so i'm guessing that you are trying to adapt the calipers to fit 288mm discs ?.If that's correct do calipers come with brackets or do they utilise the originals ?.If they come with brackets are you not going to run into problems there by trying to fit calipers to brackets made for 280mm discs ?.Same problem if the calipers use standard brackets 
.Clearance would depend on wheel size and wheel offset if you can actually get them fitted to the hub.
It is a kit, everything is included as above. I can get 280mm or 300mm and I'm not going to be running crazy power, 200/250bhp. So I'm going for the 280mm. I need them to fit under my Schmidt's or I'm going to have to buy smaller lips. and thats not really a option for me
Going to be doing some work on it this week so will take the measurements and update.
