I've got a simple mirror solution. I did it with the LJ and it will work on the samurai too.
Weld a nut unto the top hinge part...the one that is on the fender. I used a coupling but that I trimmed down a little, a regular nut was too thin and a full coupling nut was too long. I just made a simple L bracket and at one end there is a hole to bolt it to the welded hinge nut. At the other end I just bolted a 6" round mirror.
I can put it on and take it off with my bare hands. Just spin the bracket and it looses or tightens the bolt.
I'll try to take some pics but this to me was the simple solution. I tried to make it permanent on higher but I could never get a clear view of the mirror, had to bend over to look. It makes the mirror low but I find it works real good. Since you got the door off that leaves you with a great open side view of anything right to your side. You just need to see behind you. I didn't put one on the passenger side because I didn't think it was worth the effort.