I need help I have a 2017 gmc sierra I bought tow mirrors for it i have dl8 mirrors now my issue is i cant find out what size the male and female pin is on the door harness so i can add extra pins to the mirror connector and the door to body connector i need to know what the pin size and name is so i can go to gm and ask for them they just want to sell me a 300$ harness any help would be appreciated