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Impala Unique Billet Polished Aluminum Master Cylinder - Firewall Mount - Fits All. Finally a billet aluminum master cylinder that offers more options than any other. This master cylinder includes your proportioning valve and metering valve for disc/disc, disc/drum or even drum/drum applications all in one attractive housing. The upper ports are for disc and the lower are for drum brakes. Mix and match as needed. Plugs included for unused ports.