I had to replace my siezed engine on my 2002 yz426 with another engine. I purchased a 2001 that is excellent condition. I went to mount it to my bike and the swingarm bolt would not fit. The 2002 bolt was to big for the ID of the 2001 bushing. So, I pulled the steel bushings from my old 2002 casings off and found that the OD of the 2002 was bigger than the 2001, so it didnt fit. What are my options? Again: 2001 swing arm bushings are to small for the 2002 swing arm bolt. 2002 bushing's OD are to large to fit into the 2001 casings.