Sean here are a few pictures of your arm installed on my bike, the installation was no problem. It fits the swing armbut the inner race diameter is just Box section swinging arms small by a tiny amount to fit the spindle. Click for a larger view. The bike with the new shocks and arm feels solid and predictable over all a very nice piece… Randy Cooke. Substitution of an oval tube oriented Box section swinging arms its long axis vertical and the same width short axis as the original to minimize fitment difficulties.