might still be active H-D dealer #. ASB should have what you need. depending on mileage and condition of fork fluid i would also replace the slide bushings. AZmidget posted nice vid on here several months ago with walk-thru of how it's done. my recommendation? configure your S-1 so that front wheel off the ground....bike stable...remove the fork tubes yourself....take them and the new replacement parts to any shop familiar with showa cartridge fork tubes and have them do the seal and bushing replacement. others well intended will suggest DIY job but i'm telling you it is NOT for the faint of heart.