I found a set of '03 power/heated mirrors at a local truck dismantler for a pretty good price (even got a little trade-in value for my take offs) and bought a set of non-powere/heated mirrors from the dealer for my '01. I used the '01 bases and put the '03 power/heated heads... do a search, there are some good instructions in here someplace. It took a little hit and miss to get the wiring right because the '03 wire colors are different than the '01 harness, that information is in the instructions also. It took me about a half a day mainly because I don't have the greatest set of tools but they work perfect, look perfect and make setting up the mirrors for towing soooo easy.
Mike