The ONLY Falcon hubcaps that would have been used on Mustangs were the Wire Wheel Hubcaps... but there were many different types of Ford Wire Wheel hubcaps. They have to be the right Wire Wheel Hubcap for the time period of the car.
Take a good look at the VERY LAST picture that you posted with the (6) Hubcaps....
ALL those hubcaps would be correct for your '65 Mustang EXCEPT the last BOTTOM RIGHT TWO Wire Wheel hubcaps. Those are considered '64 1/2 Hubcaps....and they have the BIG SPINNER with a Red/White&/Blue Crest.
The very most Top Right Wire Wheel hubcap is "Considered" correct for regular '65-'66 Production cars. It has the smaller, thinner Spinner with a Blue Center and Ford Crest. It is the most common Wire Wheel Hubcap. It is also Reproed and you can buy them through NPD. They are also "Correct" for the 1966 "Sprint 200" Cars as well.
Keeping all this in mind, Back in the 1960's, If a buyer of a Mustang wanted a new set or a different set of hubcaps than what was Originally supplied on the car, They usually got whatever the Dealer still had in stock... Mixing and matching '64 1/2 Hubcap sets with Regular Production '65 cars and even '65 hubcap sets with '66 cars and so forth. The Selling Dealer could do whatever he wanted...and often did. And if the New Selling car Dealer was in the Ford Dealer Selling Network, but Sold other Makes of cars as well....Fuggetaboutit.....Anything goes.. Some Car Dealers in the 1950's and 1960's sold New Ford cars, but WERE NOT Ford dedicated Dealerships (Even though they were in the Ford Selling Dealer Network), and sold other brands of cars as well...not just used cars...but other NEW Brands. I would assume that ended sometime in the late 70's and early 80's.. I remember quite a few Dealerships in Pennsylvania and here in Florida that sold Multiple NEW brands of cars. They were mostly smaller Dealers with Small Dealerships. It would be interesting to know what the Dealer Restrictions were at the time... Somehow I don't think they got obeyed and Ford probably didn't care too much at the time as long as the money was still rolling in...and the checks cleared....They just didn't tell HFII...
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Tony K.