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On my 2010 spec sheets I have these: Laramie GPC Power Chrome Trailer Tow Mirrors (the chrome ones also have the memory feature)
LEBP Ext. Mirrors w/ Supplemental Signals
LECP Exterior Mirrors Courtesy Lamps
LEMP Exterior Mirrors w/ Memory
LENP Chrome Exterior Mirrors Big Horn (SLT) GPG Power Black Trailer Tow Mirrors
LEBP Ext. Mirrors w/ Supplemental Signals
LECP Exterior Mirrors Courtesy Lamps
LE4P Black Exterior Mirrors
I think you'd just have to update the truck software with the sales code for the mirrors (in your case "GPG") because I think the only sales codes that can be entered/updated are 3 digits. But ask your dealer/mechanic if they can add the 4 digit sales codes "LEBP" and "LECP".