top is a GP40-2. Trucks are incorrect for GP50/60 (although I don't know whether Athearn decided to be cheap and put in incorrect trucks)
I concur with Jerome & diburning, Athearn GP38-2, GP40-2, GP50, or GP60 bodies will fit either of those frames. Fuel tank sizes are irregardless of model, but rather the choice of the railroad itself. (although GP50-60s tend to use the larger one)
Smokey Valley makes proper truck sideframes for GP50 and 60's that will fit those trucks.
But I imagine AllenB is scratching his head right now...![]()
