Buy a new Redcat Volcano/Exceed /HSP/Himoto all same truck
Himoto and Iron Track arent the same as the HSP based stuff actually. HSP,
Redcat Racing, and Exceed RC all share the same parts, but Himoto and Iron Track are from a completely different design. As for parts, you can source them from
Redcat Racing (priciest option), NitroRCX (doesn't always have everything in stock), or, the best option is look on Amazon and eBay. You can find parts under HSP, Exceed RC,
Redcat Racing, as well as Hobby Park. For a nitro truck, i would start with Hobby Park, since most of what they sell is way more durable than what HSP, Redcat and Exceed carry. For example, lower arms from Hobby Park are milled aluminum, and the others only carry stamped aluminum, which is weaker. I recently found out that Hobby Park is actually considered an aftermarket supplier for the HSP based stuff.
EDIT: One thing you are definitely going to want to do is upgrade the steering bell crank to aluminum. The plastic one tends to be extremely sloppy, no matter how tight you make it. This is the one i typically use:
https://www.ebay.com/itm/224566554908 make sure to use Loc-Tite on the screws.