IIRC, outside mirrors were shipped to the dealer for installation. They ended up being put in several places at the customer's or dealer's discretion. I've seen "factory" mirrors on the doors and fenders of both '55 and '56. Speaking of right, the right mirror usually is worthless on this vintage. There's no right answer, unlike "lesser" models such as Dodge which had one spot for the mirrors that actually worked. --Roger van Hoy, '55 DeSoto, '58 DeSoto, '42 DeSoto, '66 Plymouth, '81 Imperial, Washougal, WA