I have a 99 YZ400. Can I use the rear arm off an 01 YZ426, or an 03 YZ450? The part number for the 99 is 5CU-221100, the 01 is 5MV-221100, and the 03 is 5UN-221100. Are they different sizes, or just updated part numbers??? Please answer quickly, I need to get this thing bought so I can start riding!!!!!