i figured out what i need. i need one from a q45 without 4 wheel steering (12303-60U21). whats the difference between the two? is it just the amount of belts it can hold, it is for the same engine after all so they both should absorb the vibrations the same unless (from what i thought before i started this thread) each balancer was designed for the specific motor its going on because 2 of the same engines may not run the exact same.