Most of the Turmoil parts are universal with the Mayhem, but you may want to try looking around first for the Mayhem parts. Because they are discontinued there are alot of discounted prices, clearances, etc on what shops have laying around. Try [link=http://www.horizonhobby.com/Products/RelatedParts.aspx?ProdID=SWK1202&Category=Parts%20 Listing]Horizon Hobby[/link], [link=http://www.wholesaletrains.com/Search2.asp?Search=mayhem&scale=%25&offset=25]Wholesaletrains RC [/link]or Ebay ofcourse. At wholesaletrains if you plan on buying a decent ammount of products you may be able to email in your list and bargain an even cheaper deal. Same thing goes with Ebay, if you find people selling multiple stuff or a truck that has some engine problems or something, it may be worth getting just for the parts.

Hope this helps.