Comes with both Masters. Used. Fit standard Wilwood mounting locations. 

Composite Master Cylinder: Wilwood’s high strength, lightweight composite master cylinders combine aerospace manufacturing technology with racing performance requirements. The carbon reinforced composite reservoir is molded around a durable aluminum bore which is brush honed to ensure maximum cup seal life and fit. An increase of 30% more stroke provides greater volume eliminating pedal pumping and a large fluid reservoir with unique internal baffling prevents fluid aeration and assures volume requirements to accommodate the long 1-1/2” stroke. Composite material resists heat retention, lowering fluid operating temperatures, while the compact design weighs only 14 ounces - less than half the weight of similar master cylinders. Wilwood’s composite master cylinders incorporate both front and side mounting capabilities.