[moparguy]

"Seems like original Passenger side mirror arms are not easy to find. Repops are cheap and some are being offered with the 5x7 square mirrors. Do you think a repop would WORK on a standard 54 without having to be bent?"

If sold with rectangular mirrors one would expect them to work. I'd make sure they were returnable just in case though.

I only have experience with the stainless coated potmetal arms I purchased from Chevys of the 40's, also most vendors list the arms as being the same for all series 1 trucks, 1947 thru 1954 (some show thru 55?). So, that said mine were sold with a round stainless mirror and didn't have sufficient adjustment range with the rectangular mirrors. It broke when I tried to bend as required to get enough range of adjustment. The original steel arm was easy to heat and reshape.

The reshape requires heating the last bend, straighten the arm and then heat and move the bend intoward the mounting point, this makes the section the mirror attaches to longer, allowing you to adjust it as needed without it contacting the mount arm. Guess the simple thing to say is the bend closest to the mirror has to be changed.

Also, attaching the mirror to the mount arm with acorn nuts would be better, it's on my list.