For those interested in making a mirror arm for the right side of the 46 Studebaker pickup, I'll show how I went about copying the left side arm.
This is what I started with. This mirror arm came with a 5"round non glare mirror head that I bought on eBay for the truck. I have no idea what the arm was for, but it was a start. I first made a template off the drivers door for the outer skin and another for the front of the door shell, flipped those patterns and market the right door, cut the hole in the skin and then went to the next step.
After heating bending and hammering the arm into the right shape and welding the hinge mount part into shape and cutting the extra length off the end. I hammered and shaped a round for the mirror head to mount on. I cut two pieces of plate and welded those to the arm and together. Then I ground the weld to shape.
After fitting the arm through the hole that I copied from the left side door, I drilled through the front, holding the arm in place and made a mark in the mirror where a 1/4" countersunk oval head screw will go. I then removed the mirror arm and drilled that hole and threaded it 1/4-20. I bolted the mirror arm in with one hex head bolt and then drilled the other two holes into the arm slightly in order to achieve a precision fit for the finish bolts. I then removed the arm again and drilled and tapped the rest of the holes and then recessed those hole to allow for the countersunk screws. I then bolted the arm into place with some sacrificial screws and heated the hole in the door shell, and ran the screws in while it was red hot, in order to create the countersink.
The process actually took me about 6 hours to complete, using a die grinder 3" cutoff wheel, oxy-acetylene torch, hammer, anvil, vice, drill press with several size bits including one to recess the holes like the original, a 1/4" tap, and impact driver. I had some flat stock in my inventory for the mounting part. I used a mig welder to make it one piece and used a thicker cut off wheel for grinding the weld as well as a roloc disc and a rotary file in the die grinder. I hammered the areas that show that were "too smooth" in order to give it the natural cast look.
I since ordered and received some oval slot head finish screws for the final assembly. I'm pleased with how it turned out, and can now have a right side mirror. 
Here is the 1937 Chevrolet Pickup Right Mirror Arm that I made.
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