Sorry it took me so long to get back to you. I just had lower back surgery, and I can't get around well yet. As soon as I can get back into my shop, I'll dig out the pully I have. I told you it measured 3.5 od. I'll remeasure it to see if I made a mistake maybe its 3.25. If not, would it help if you had both pulleys top and bottom? I have 2 more weeks of recovery before I can get out and do things. Maybe with both pulleys you can move the power steering pump and alternator out a little with washers. Mike