stock stem ('93 gsxr 750). went to the local bearing store, looked in the timken cross reference for '88 sportster and '93 gsxr and got as close as possible. kept the stock HD races and found timken bearings that would fit the stem o.d. had to turn the stem a few thousanths for the lower and had to make a small shim for the upper. biggest obstacle was finding a working lighter to fire up the propane torch to heat the lower triple to press out the stem. DO NOT try to beat it out with a "one pound hammer" (see Bob Steele or John Gonutskie for definition), all it does is make noise. a little heat and about three pumps on the 20 ton press and presto. neck on the sportster is apprx. the same height as the metric bike (probably an industry standard? more likely the metrics copied HD?) so the whole front end just dropped on like it was made for it. you may want to use the 3/4 inch controls from the donor cycle or fab shim stock to adapt the 1 inchers stock from harley.