Don,
Click on "View Large Image" beneath the photos. You will see a bolt head that holds a zinc-plated bracket to a pivot-socket on the back of the mirrors. Get rid of the bracket.
The bolt diameter is a little larger than the diameter in the standard Advance-Design mirror arms - just drill out the hole in the arm.
I like stainless hardware, so I cut the head off a stainless steel bolt and put a stainless acorn nut on threaded shaft.
Also, on one of my trucks, I put 6" convex black mirrors on both sides. The viewing area is excellent.
Tim
