do your self a favor and read the stickies at the top of the page. post up an intro telling us a little about your self in the intro section. To answer your question, I believe the sportsters went to disk frontends in 73 and had 7/8" necks up until the 90's. Find yourself a 35mm frontend from another ironhead. a complete frontend with wheel, brakes, etc. can be had for a couple hundred bucks. you can also use a 35mm frontend from a big twin, but you would to swap out the lower triple tree for one for a sportster, because all big twins have 1" stems.