EBAY a good place to start .Craigs list also . Get on a lot of forum sites for this stuff n post what u need . rc groups , rcuniverse ,,,
https://www.ebay.com/sch/i.html?_from=R40&_trksid=p2380057.m570.l1313&_nkw=+XTM+X-Factor+parts&_sacat=0
Good luck