I found a RH tail light bracket for my ‘29 Tudor with Model A parts guy in NZ. Look for MAFCA clubs in countries that drive on the right side of the road and contact one or all of those clubs to ask for assistance in finding a RH mirror for your truck.
I have been searching the forum for info on how to repair a loose outside rearview mirror on my 1930 CCPU? Not sure how one tightens the 'grip on the ball'?