Here is a pic of the OEM one cut down for the SWB on top of the LWB one, notice the ribs of the LWB are rounded and don’t go to the edge.
And from the ‘88 and ‘91 accessory catalogs, respectively.
It’s just a cheap $20 tip with integrated clamp, it will probably rust within the year. I just want the exhaust gases away from the end cap, I only have two more replacements.
Then there should be another set of holes for the lower mount.
Unless these aren't the OEM mirrors and they used only the lower mounting points. @coheedand @Sasquatch what is the distance between the lower mount and the horizontal bracket?
Those are the original mirrors.
There were five types of mirrors:
"Flag" type that attach to the top of the door
"Towing" type that attach to the door like yours and three that attach in front of the triangular window:
Power remote
Manual remote (joystick inside)
Manual non-remote
That plan uses pocket screws, a little more advanced but there are many YT videos that just screw/bolt it together.
I also plan on making a table out of another tailgate to complete the set.