my 71 K20 Burb has factory sport mirrors, no other holes found in the door..
right side mirror head was broke off when I bought it and it's a little tough parking squarely on the curb without it..
so I bought the LMC pair with built in fisheyes, cool right?
so after drilling screws to remove the door panel [saved every thread in the door btw
]
chasing threads and lubing everything, I installed the mirror with three arms, yep, that's about how it went..
and now I can't see a damn thing next to the truck with it, from the driver's seat anyways
mirror head binds into the arm no matter which way I turn it
well, it is a 'passenger' mirror so I guess it's for passengers to see behind the truck
useless as a screen door on a submarine..
door and window hardware however are all working smoothly now
