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There ARE two different sized cop caps - the '66 - older and the '67 - newer. They are different diameter. The statement holds true that the cop caps will fit 13", 14" AND 15" wheels of the respective era. The big cop caps fit all of the early wheels, and the small cop caps fit the newer wheels. Except Imperial, which never had a provision for a cop cap, of which NO cop cap will fit them!
I would like to respectively, clarify that the 67 on down used older, bigger caps and the 68 on up used the newer smaller ones. They differ by 1" in diameter.
The change came about in the 1967 model year. I've owned a couple of dozen '66 and '67 cars each to know this to be a fact. Check your factory parts manual - you will see different part numbers for the '66 and '67 wheels. The 1966 - earlier wheels (cars) use the larger caps; the 1967 and newer wheels (cars) use the smaller caps.
For example, the 1966 - 1968 Dodges use a very similar STYLE cap, but the '66 have the larger of that style, while the '67 and '68 have the smaller cap of that same style.
Left = '66. Right = '67 & '68. Size-wise, the larger cap is just over 10", and the smaller cap is right at 9" in diameter.
Well, I stand corrected. I've seen several 67 Coronets with the older style that looked to be all original. But it would be easy for the owner to put different rims and tires on.
I have a 67 Coronet 500 that I still have the 14" rims and full hub caps. I'm going to see if the older style fits them as I have a few of them.
Here's a picture of my car now. It's very hard to find the old style wheel in 15's
That's because the only old-style 15" wheel (in a 5-on-4-1/2" BP) is found on D100 pickups. All lines of Chrysler, Dodge and Plymouth (except A-bodies, which had 13" or 14" on a 5-on-4" BP)) pre-1967 had 14" wheels back to about 1960. Except Imperial, which were 15" and a larger bolt pattern (5 on 5"). The 15" didn't come about on "B" and "C"-bodies until the 1969 MY.
I was told 60 to 66 half ton dodge pickups and mid 60's studabakers. I think mine are from pickups but I'm not sure. I know I had trouble finding them.
Then I had to widen the rear wheels and then I used newer front wheels since they had a better offset. I just welded in 1/2" bolts so the older caps would work.
You are correct in the truck wheel, but you can push that out to 1968 on the D100. Sixties Studes have the same bolt-pattern as C-P-D and had 15" wheels on the 1960 - 1966 Larks, Daytonas, and wagons. I forgot about those! Their hubcap size pattern is the same as the earlier Mopars, IIRC. I'd have to see a buddies' '64 Lark to verify that, though.
I'm pretty sure AMC had 14" wheels through the Sixties, as they went to a 14" wheel in the 1957 MY; which was also the last year for Hudson and Nash as separate nameplates (becoming AMC/Rambler in 1958). When AMC went to a 15" wheel later on, I really do not know.
The old hub cap debate. Well the above discussion is half right. 66 and 67 Coronets and Belvedere lines used the 10" button. However 66 and 67 CHARGERS and C bodies used the 9" cap. Reason: mopar switched over to the deep dish wheel design, and a prelude to the 68 change over.
And the Charger wheels were indeed different, but the '66 had the large cap, deep-dish wheel; and the '67 had the small cap, deep-dish wheel. That reason also applies to DISC-BRAKE '66 and '67 C-bodies, NOT all C-bodies.