Chevy Power Steering Pulleys

Chevy Key-way Pulley
Shaft Diameter:  5/8" (.625) Keyed Fit
Diameter:  5.8"
Offset: 0.925" (Distance from the front face of the pulley to the center of the first V-groove)

Ford Power Steering Pulleys

Ford 289 / 302 pulley
Shaft Diameter:  0.687" (11/16) Press Fit
Diameter:  5"
Offset: 0.85" (Distance from the front face of the pulley to the center of the first V-groove)

Ford 351W, 351C, 351M, 429 & 460 pulley
Shaft Diameter:  0.687" (11/16) Press Fit
Diameter:  5"
Offset: 1.35" (Distance from the front face of the pulley to the center of the first V-groove)

Ford Pear Shaped Saginaw Power Steering Pump
Shaft Diameter:  0.750" (3/4") Press Fit
Diameter:  5.9"
Offset: 1.35" (Distance from the front face of the pulley to the center of the first V-groove)
** This pump is easily identified by the pear shaped reservoir built into the pump housing