the studs wont need to be longer to fit a bigger offset the hole will just be deeper i would have thought!
the st brakes are really not very big, the only way to find out is to put one on the car and find out!
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Red Escort 1.6LX
Then - Red Escort 1.4
Then - Silver Fiesta ST 170BHP
Then - White Fiesta ST MR200+
Now - Mitsubishi Evo IV Forged 2.3 500BHP
and Mondeo Mk3 2.0TDCI