Back a couple years ago when chop shops on ebay was booming ,those parts were a dime a dozen ,
they still are pretty cheap to buy ,I think they are only about 6 to 10 bucks.
I have a butt load of those small parts including that servo tray.
Servo's are surprisingly cheap ,the truck requires 3 ,but you actually only need 2 ,throttle & steering ,
the reverse can be locked in place by a piece of wire.
Does it have the servo module tray ,or is it missing?