Sounds like the ad I posted quite awhile ago. Here's the explanation: When I bought the Valiant it had 13 inch wheels with hubcaps (but not the "mag-style" ones). The 13 inch tire wheels had to go, so I went thru my wheels and found 5 14 inch SBP wheels. I really liked the "mag-style" hubcaps so decided to go that way. As you've found out Formula S 14 inch hubcaps seem to be nearly impossible to find in any condition - took me nearly 3 years to find what I did. That's why 14 inch wheels and "S" hubcaps ended up on a 65 Valiant - just cause I liked them!
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Called Layson's...they told nme 1964-65 Cudas with BIG brake drums had 14" wheels.
SO why are the 14" wheels so hard to find,
and
how come people with original big drum cars mostly have 13" wheels?
Actually the only ones that came stock with 14 inch wheels were the Formula S cars. Even 273 2 barrel cars came with the 13 inchers. I don't know for sure if the 14 inch wheels were even optional; all my 65 Dart literature says only 13 inches tires was the only tire available - even with the 273.