Pike1612, I believe this is related information you are looking for, using Google...
420556 (1642639-001) Float Needle and Clip
1989 Harley Davidson XLH1100 OEM Parts, 1989 Harley Davidson XLH1100 OEM Motorcycle Parts - BikeBandit.com
But I would trust Fin_676 regarding part numbers as he has the experience with this...