If you bought your truck new and still have the bag of goodies that came with it from new, there is a new steering horn and throttle horn in that bag of parts. The Hitec throttle horn should have the number 24 on it, and the steering will have either 24 or Hi on it.
Simple job to fit as well, just make sure to fit the servos first, and power them up to get them to neutral, set the trims to "0" and then drop the horns into postion and tighten them down.
Final step is to take the beast out the front and have some fun.