The O-Ring gasket for my FXDWG3's clutch inspection cover is supposedly PN 25416-99A, but when I search at Zanotti's, the part number isn't found. This bike of course has a TC88A engine.... you'd think the PN for this part wouldn't have changed.... anyone know the correct PN? (The Harley website is worthless when it comes to finding something like this.) Any/all help appreciated.