I may be right in saying that K Sport stuff doesnt have a dust seal so make sure you get them off and keep them uber clean once in the summer and twice in winter, piston corrosion will be your problem not disc replacement, the rotors look like AP items anyway, cant tell the PCD but they look like CP4542-106/107's
The brakes are cheap to buy but expensive to maintain (Like a HP Printer!)
At the price you paid I'd have bought them myself but ask yourself why Forge didnt continue with them.....I dont think the reason you mentioned isnt too valid really, you'll get any 6/8 pot on a 356mm disc inside an 18" theres no way you'll get them in without a wheel spacer in either case especially on a 32mm wide disc
Nice buy,heard you get a bit more pedal travel with these
Forge said thats not the case as its one of the questions that i asked, i got the impression that the reason they went down the 6 pot route is that the 8 pots will only fit under 19's where as the 6 pots might fit under 18's.
Piston sizes look fairly good for an 8 pot should get a half decent pedal with these