I fitted the GT3 brake to a ball joint front end and had issues with the clearance between the calipers and the 17 inch wheels. Wheels are/were 996 BBS 7x17 50mm offset. I fitted a 2 inch narrowed beam and then added porsche 25 mm (1inch) wheel spacers. This cleared the calipers a little more and also gave more room on the inside of the wheel to the axle beam.
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Andreas
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