You can ream it out to .531 (I think!!! Don't quote me) or I bought a bronze one to fit my 5.0 TFI distributor from summit, crane cams. <br><br>If you don't wan't to spend the money, I will check the dimensions when I go home, but I am sure someone will chime in first. <br><br>I was chicken that I would not get the gear right and I would have it bouncing around my engine till it ground to a catasrophic halt, but I am paranoid about my lack of mechanical abilities.<br><br>