I purchased a CAT GP25K (S/N AT17C00109) on auction, knowing that it had throttle body issues on its Mitsubishi 4G63 engine. However, once I picked it up, the entire throttle body is missing. I've been told that this vintage unit has a 1-2 yr only model throttle body and they are impossible to find. Can an aftermarket propane carb be fitted, using a throttle cable to activate? Or is this impossible because of the feedback req'd for the ECM? Or, would it be better to try and obtain a later model throttle body, along with the ECM and wiring harness to retrofit. Thanks for any help or advice that can be offered.