Can't remember if its the steel part or the aluminum but either weld it or have some one else do it and roll on. If your real anal I'm sure you can buy an extra off some one since I've seen a few around or go to the stealership. Mine was broken up pretty up pretty bad after a forrest ranger hit me in a diesel truck and it rolls just fine now. Good luck and Happy New Year. Mine before and After it was welded.
i just bought one from yamaha... 350+ tax and when i picked it up from the dealer i could bend it by hand. now thats quality!!
if yours is just a crack i would consider having it welded just have to find someone that is capable of welding aluminum of course.