I snapped a some pics of what mark is talking about, the larger one actually was on a sears bike when I got it, looks like its going to match up just right on the el tigre I just got that has an hs50 on it as well (even where the extension mounts to the fender). Now all I have to do is try and make it look better:doah:
I measured almost an 1/8" difference in the I.D.