Modifying the 930 Turbo 3.3 rear caliper to bolt to 911/SC/Carrera and 914/6 rear trailing arms

Modified vs unmodified caliper (back view)
Modified caliper (front view)
Fixture to spot the new mounting holes
Counter-boring the backside to accept spacers
Machining off the old mounting ears
Ditto :)
Machining fins off the front side of caliper to give extra wheel clearance on narrow body 911's & 914's
Finished inner half showing counter-bore and mounting spacer for proper caliper centering over rotor
 
Caliper half on left shows completed maching. One on right still has the original holes, showing the difference between the two.

 

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