Hi Mate,
Just to confirm the part numbers if its 996.351.431 then what you have is a nice lovely pair of 996 Turbo fronts......
If the number could be construed as 986.351.421 then they are old boxster 2.5 fronts which may or may not fit over some 312mm discs depending on the model year.
If turbo calipers then the 323mm discs are too narrow and you need some R32 discs and some carriers which will require you to have 18" wheels and a 10mm spacer although you may be able to get away with 5mm spacers depending on which wheel you are using.
Zimmerman I believe do a Golf 4 R32 discs which is slightly cheaper.
If they are Red then good news if they are black then bummer........
You can fit upto 350mm discs on those calipers, which if you incorporate some offset into the bell they could be used without spacers. As those calipers were alo lagging insteading of leading you'll need to turn them around by replacing the connecting tube with the bleed nipples and vice versa, cant remember if this is straightforward on 996TT fronts I'll have alook at my set and let you know.
Be interested in knowing what you paid for them.........
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