The pulley in question is from an older model ford tbird/truck, etc. It is 6.5" diameter instead of the ~5.5" stock pulley. This not only underdrives the pulley to free up some HP (I could feel no difference in steering ability), but it helps cars with the ford a/c delete kit with belt clearance. Without it, belt clearance between the top of the wp pulley and the bottom of the tensioner is pretty darn slim.

This pulley was bought brand new maybe 1 month ago, installed onto the car, ran for maybe 10 minutes, then removed. Due to my combo, I chose to remove it and put the a/c back on. It cost me $36 plus tax here in Houston from Ford. I will let it go for $20 plus shipping (like $5)

*This is for Fox Body mustangs. They might fit other model p/s pumps, but I'm not sure. Check compatibility before buying.*

Regards,