The 4 models with coil resistance of 3, 2, 3, and 1,25ohms are ok. The rest have 20-30-40 ohms coil resistance which means those wont work too well with 12v psu. Use a model with 3 or 2 ohms, i would avoid the 1.25 model because rumba has 0.1 sense resistors which may be considered significant relative to 1.25, which sort of bends a principle that sensing part should not change the sensed system too much. Imo.