I remembered the Redcat Everest-16 rock crawler that was a donor for my Structo Dump originally had a 280 / 370 motor. So ordered pair of Redcat 'RC370' 28026N motors.
Redcat motors are a direct swap into those jsx-370 series gearboxes.
Screws were originally installed with very much red locktite, assume the need for heatgun or soldering iron to break hardware loose.
Brass worm gears are a press fit on rotors, but you can lever them off the original motors with Diagonal cutters.
Uh, gear ratio is probably WAY off. But i'm learning. Maybe?