Rootes # 6100031, Ford part number is C4JZ-6312-A, only industrial Ford Truck dealers could order this part about 20 years ago. Dia. is about 6 1/16", Depth 1 7/16 (face to rear) and from the center of the belt groove to the rear mounting surface 1 1/8". You won't find this pulley on anything but a Tiger or an old Ford industrial engine. David Franchi