Mine needs to be replaced. I didnt wreck it but the guy that owned it before me did and it bent the muffler mount just enough for it to be a problem. Can I use a subframe off an '02 YZ250F? The part numbers are very similar. '02 YZ250F 5SF-21190-00-00 '03 YZ450F - 5TA-21190-00-00 Thanks for the help!