Without a mind meld I wouldnt be able answer that question , but its been posted around various forums since it appeared on the UltimateTraxxas website, and a few members here have done there own BackSlash conversions, might be worth having a bit of a dig/ search....
Welcome 83Bronco. I've also had bad luck with some integy aluminum parts. I started replacing them with the broken plastic parts on one of my minis and the integy stuff broke faster than the plastic stuff. LIve and learn I guess. Looks like a nice build.