pretty sure there is somting to do with the spacing of the disc to caliper relationship that fucks you up but why not go the skyline caliper its a 4pot and it bolts straight on,its lighter too alloy not cast iron,you can buy custom hubs off ebay and then you use 300mm BA falcon rotor, all been done before on here if you do a search,I've done it and they work very well, think the whole conversion with buying all parts and me fitting cost $750
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