brake upgrade

hi guys
im looking for

upgraded master cylinder and servo (believe this should be off the mk2 16v)

also

upgrading my standard gti brakes and callipers to 280mm

G60 or the cavalier conversion

any option im open to need to stop 180bhp or if there is someone out there doing the complete conversion

my car is a 88 clipper gti based in yorkshire leeds

cheers