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Sortofa65 is correct. The wheels you have are what are called "innies". The nubs that hold the caps on are on the inside of the lip. They were common through '66 and the original bottle cap style hubcaps that fit are reproduced. The cap you have would fit the later years "outtie" wheels
Have you seen this ad, from the FTE Marketplace? It’s what your truck should look like, to me, and is a whole bunch better than the other caps you posted.
Not so sure that the stock innie F100 wheels are actually 7” wide, since my F250 came stock with 6” x 16”. Someone here will be along shortly that does know. I saw your other post looking for two more outie wheels so you can use those other caps. I wouldn’t do it, I’d buy that complete set of wheels, tires, caps from member SSgt82-02, if I could, they’re a great deal.
But, if you must, there is a set of tires, wheels, and those same caps for sale on FB Marketplace in Los Angeles, your neck of the woods, I believe. I can never seem to get links to FB ads to post here on FTE, but you’re a bright lad, you can look them up, I bet! The sellers name is Peter Acosta.
Rezvani's Latest Post-Apocalytic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.