Hi mate I'm sorting one at the mo there are two company's ive found 1 pace radiators they are in the Cambridge area they quoted me 3 prices a £450 + vat for one that some of the guys have on here or option 2 was a bigger rad for £521 + vat or 3 another version for £ 640 + vat, I then went to county radiators southend on sea essex who quoted £ 312 + vat my pal has had this one but we found it needed tweaking so the cost now is £350 + vat this is slightly thicker than the standard rad so shouldn't get the dreaded overheating If you need the ph nos give me a shout here is a pic of the un tweaked version hope this helps.
The Pace rad fits both a standard bike and a bike with a TT tank.
I took two bikes to Pace as guineapigs when we built the prototype rad of their design.