Simms fuel injection pump diaphragm and piston commonly fitted to Fordson Dexta inline pumps with a vacuum governor
If you have a Nuffield pump with a BMC engine. these have a unique centre boss and will need modification using your old parts.
Approx 92mm in diameter with a 12mm pin and a 6mm hole through the centre
Fits the following:
SPE3A Perkins P3, P4, P6, R6
81716957, 7034-19A, FORD E354CL9, E354-CL-9, VOLVO 0078079-1, LEYLAND 560-865, LEYLAND 7H127