On your 2003 Gulfstream Friendship Quattro, there are a couple of things I can help you with but not the outside mirror motors. I can help with the step motor and the water pump.
For your water pump (since a motor isn't separate), I recommend the Flow Max RV Fresh Water Pump - 12 Volt - 3.3 Gallons Per Minute - 45 PSI # LC689052 if your current pump is powered by the coach batteries. If it is powered by shore power only, then I recommend the 115V option # LC689054. I've attached review... view full answer...