This CNC-Series 5" billet aluminum power steering pump pulley is designed to work exclusively on Ford power steering pumps.
Depending on year and engine size Ford offered 2 different diameter pulleys, a 5" and 5.5".
Be sure to measure your original to get the right diameter. They are interchangeable and both will work for just about any application.
This smaller 5" version provides more power assist at low RPM especially idle but not ideal for racing or high RPMs.
The larger 5.5" is best suited for high RPM and high speed driving.