Harley Aluminum rims are Borrani, not Akront, although either will work. The spoke angle needs to be correct and it needs to be a WM3. H-D didn't use any until '60 so I guess you know it is not correct for a KHK. An early 70's drop center type also works but the best is a stock early Sportster one (43008-60). Real KR rims are usually 19", Sportster are 18".