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I have an early production 69 RS SS  ( Oct. 3rd week 68 Camaro ) I'm still leaning about the car any my question is the car has 4 piston calipers on front. I can't find any info to support 4 piston calipers on a 69 car. I also need to replace my current master cylinder and would like more info on 68 surplus 5460346 US stamped master or should I stick to 5468309 unit.