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As Steve noted for '77 930 which should have boosted brakes just buy a late 930('78-89) m/c. Its a bolt on and is 23.8mm.
also as Steve alluded there are 2 different Ate non boosted 23.8mm m/c, the one to use on a non boosted 911 is
ATE (ports face left), # 03-2123-3402.3, current as of 4/04, yes these were oem on some Mercedes trucks
It's better to buy a kit from smart racing or Steve. The kit includes the m/c , the correct operating rod(which is not the same as that used stock), several feed fittings w/ the correct geometry and a length of feed line to complete the install.
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