Dudes chill, i was just going by what i was told in the RVF section on 400greybike, i read on there that 65mm Brembos bolt straight onto the RVF and with the RVF having the same bolt spacing as the MC28 i assumed...

i bought the adaptor plates from Jamies site to fit Brembos onto my 21 i measured the pistons and the Brembos are about 1mm bigger and weighed the calpers and over all the Brembos were a wee bit lighter, so not a massive performance upgrade but they will look nice

found out some more info : you are right Brembos will not bolt directly onto a MC28 but Brembo make an adaptor plate for the RC45 so that you can fit 40mm pitch Brembos to it, and with this adaptor Brembos on a 28 as (i am told) the PCD is the same as the 45.

sorry for the confusion.
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MC21SP - Roth-tax
CBR400 - track
MC21R - sold
MC21SP - sold