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1964/66 F100/350's use the same chrome (C4TZ-17757-D) & painted (C4TZ-17757-C) front bumpers. These bumpers have 2 mounting holes per side.
C4TZ-17752-A Right & C4TZ-17753-A Left .. Bumper Brackets / Obsolete
The truck parts catalog doesn't list the applications per se, just says 1964/66 F100/350. But I don't recall that my purchased new 1965 F100 2WD had bumper brackets.
So these brackets may only have been used on the following: 1964/65 F100/250 4WD / 1964/66 F350 / 1966 F250 4WD
Dave (garbz2) will know for sure.
1961/63 F100/350 chrome (C1TZ-17757-J) & painted (C1TZ-17757-K) front bumpers have 3 mounting holes per side in a triangular shaped pattern.
And btw: In 1967, FoMoCo changed the design of the front bumper ends, but kept the same 1964/66 part numbers.
So, the C4TZ bumper applications are actually: 1964/77 F100/350 & 1978 F100/350 before serial number AG0,001 (except 1973/78 Ranger XLT's with horizontal bumper pads).
The bad news is, the only bumper that is reproduced (chrome only)...is the 1967 and later type. No one repro's the 1964/66 originals, or the painted version.