I'm trying to identify a flywheel thrust washer for a 1975 XL. Thought you might be able to help. I ordered a set of OEM 6506 washers as being correct for the 1975 engine. Thing is they are too small on the OD. The original washers had a step on the ID. I've tried later thrust washers and they don't fit either (thinking someone had retro fitted a later set of flywheels). I don't have a set of 23972-57A or 23972-72 to measure but I believe they are the same size as the 6506. The 6506 washers are 2-1/8" OD, 1-3/8" ID. The original washers are 2-3/8" OD and 1-3/8" ID and have a step. They have already been turned around and cannot be reused.
Anyone aware of what appears to be a modification to Sportster flywheels?
You can see the original flywheel thrust washer on the left of this picture https://www.facebook.com/#!/photo.php?fbid=10151379913446337&set=pb.353303546336.-2207520000.1356513583&type=3&theater
Hope you can help