I have often wondered. The 71-72 WOM's are different from the 73-74 so there may be a difference right there. I actually have a 72 sitting here with no fenders on it, and a 74 fender sitting on it's deck, so I will go look and maybe mock it up in an hour or so. There are 71 fenders right there too to compare the lip, although I am unsure if I have 72 ones at all.