0.281" hole diameter 4.125" outside diameter 4 bolt hole quantity 0.312 in. radius keyway on periphery of aperture spaced 45 deg below bolt hole located at 9 o clock circular
0.250" hole diameter 3.250" outside diameter 4 bolt hole quantity one additional 0.250 in. dia bolt hole located 0.526 in. from centerline of any one other bolt hole on same bolt circle circular