Guys, My 2001 Silverado LT has heated power mirrors, the small slightly rectangular ones, and I would like to put on a set of extendable tow mirrors. I want to retain power & heat function, and want to know what else I can look for (embedded turn signal, power extension, etc.) I am not looking for GM items...I have no problem using aftermarket import parts. Does anyone know what later year apps will fit my '01, whether or not 2001 models had the turn signal option? Jim