Designed to mount on Wilwood's Tandem Master Cylinders (260-8555, 260-8556, 260-9439, etc), as well as several other similar tandem cylinders. You can scroll to the bottom to see it mounted on one of those cylinders.
Wilwood Adjustable Combination Proportioning Valve w/ Bracket & Lines 260-13190
WILWOOD POLISHED TANDEM MASTER CYLINDER,1 1/8",W/COMBINATION PROPORTIONING VALVE
WILWOOD BLACK TANDEM MASTER CYLINDER,1 1/8",WITH COMBINATION PROPORTIONING VALVE
WILWOOD BLACK TANDEM MASTER CYLINDER,15/16",WITH COMBINATION PROPORTIONING VALVE
WILWOOD BLACK TANDEM MASTER CYLINDER,7/8",WITH COMBINATION PROPORTIONING VALVE
WILWOOD BLACK TANDEM MASTER CYLINDER,1",WITH COMBINATION PROPORTIONING VALVE