NOtice in the above pic, the inner belt guide is machined into the belt pulley. On my car (OBD-1 p72) I have two of those belt guides and my crank pulley has no lip on it. See the #15 / 13 /15. That is the OBD1 setup. The lower one has “teeth” on the inner belt guide for the Crank fluctuation sensor that ours doesn’t have