Motorcycle 39MM Harley Rubber Fork Boots"Gators""Gaiters" Covers - Fits Harley Narrow Glide Sportster 1991 - UP FXD and 1988 - UP XL - Harley Chopper Bobber Cafe Racer Triumph Give your Harley that classic "Old School" look while protecting your forks from debris! Listing is for a PAIR of high grade soft BLACK RUBBER Fork Boots. For use with Harley Narrow Glide Sportster 1991 and UP FXD and 1988 and UP XL with 39mm Fork Tubes. Top Bell ID = 39mm 1-9/16" (Roughly) Bottom Bell ID = 63mm 2-1/2" (Roughly) Won't crack prematurely like cheap brittle knock-offs. Comes with zip-ties. We also carry 41 mm Fork Boots for Harley Wide Glide, Big Twin, FXST, FXDWG, FXWG.