Reps sent for posting those under gasket photos. Thank you!

 

If you prefer not to splice wires and are adept at taking apart connector pins, you can remove them and solder the new mirror wires to the old pins and then pop them back into the plug:

Factory wires in old connector:



Pins with new wires:



New mirror wires on old connector:

 

Clarification:

I just did the other side and realized three of the factory colors are different.
Red on left =green on right
Blue on left = purple on right
Mint green on left = white on right


Right side factory connector:

 

The adapters that came with my mirrors don't have enough terminal pins to mate with all of the mirror pins. Does anyone know what size, or part number the pins are, or where to buy them? My truck is a '99 F-250.

Molex #?
Tyco #?
TE #?

 

I finally installed my mirrors, last week.
What a remarkable difference.
I just connected the round connector and am using it like it was before.
I can actually see who I'm backing over.

So much better when backing alongside my trailer.

I haven't been able to see well enough, to run the new wiring from the
inside of the door, to the inside of the truck.

Too much stuff in the way.

Does anything inside the truck have to be removed (other than the kick panel), to route the wiring inside?