I just climbed into the engine room and double-checked. Mine are the same size on each side of the Heat Exchanger. I also measured them and 3367 is the correct size at 32mm ID on one side and 51mm on the other. However, take this with a grain of salt as I have no idea if Amel used the same cooler on all SMs.
SM #440 Cara
Deale, MD USA