The mirror cord from Blendmount has a built in hidden fuse and two metal prong that insert into the slots on the mirror harness.
Requires no modifications. I believe the red goes in the far passenger side and the ground in the far driver side slot on OEM mirror.I can post a pic in a few days. I ordered from Blendmount because they have both the mount and cord, other comparable products out there
Any issues with the cords coming loose? That's the biggest complaint I think I've heard about that method of 'hardwiring' to the mirror.