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No such critter ever existed (from Ford). A right/passenger door mirror was produced in limited quantity for the 1967 Thunderbird as a dealer-installed option, which was a mirror-match to the left/driver door mirror. In '68 and later models, the left/driver door remote mirror was slightly larger than the '67 left/driver door remote mirror...no scale match right/passenger door mirror was produced. The '68 design continued through '70, but was changed in '71. The '71 left/driver remote mirror was very similar to the Lincoln Mark III's left/driver remote mirror, but a passenger/right door mirror was not produced for that Lincoln, nor was there a matching right/passenger mirror for the Thunderbird produced.
Some crafty enthusiast had engineered a passenger mirror for the Lincoln Mark III by modifying a left/driver door mirror (this may be a solution if you're a good fabricator)...