Hey David, do you happen to still have any of the original mirror arms? I've got one a lower one with a ding in it, and would like to find a replacement. I saw some replacements at the auto parts that were paper thin... Not though like the originals... They could practically hold the rig up.
Next up will be adding some 7.5" convex mirrors if the bolts will ever come loose. The impact couldn't shake'em loose. The mirrors will move now that I've added some ATF... Let'em soak and try again later. Alternating heat and ice will be next if they won't loosen with penetrating oil / ATF / brake fluid... Heat is a last (later) resort because I'd rather not burn up the fiber washers which allow adjustment nor do I want to discolour the polished stainless if avoidable.
It's a trip down memory lane to see where we started... Some people worry about ambulances being clean, when I look back at how mine looked after years of being used by contractors, I'd take disinfected any day over 1/2" of grease & crud.