I can't be sure when the change over was but the 8v's had the calliper carriers built into the hubs until the run out editions that had the 16v lights etc..
If yours is one of the early models then you will need to get hold of some 16v hubs to upgrade to the bigger brakes.
standard sizes are...
8v = 239mm
16v = 256mm
G60 = 280mm
If i was you then I would go for the G60 upgrade, that's what im going for myself as the 256mm brakes arent up to much!!
I don't know about the servo but the 16v may be biggerÂÂÂ

Oh, nearly forgot...if you go for the 280mm then early mk3 VR6 callipers are the same..and you will need the carriers for whatever callipers you are fitting
