64-66 abody radiator brackets for shroud

Here's what I have for radiators in a couple of my original '66 Barracudas. My 273 4bbl 4 speed Hamtramck 49 state car has the 2582930, which has a 2 row core. My 32,000 mile survivor is a Formula S auto. LA plant Ca car. with heavy duty cooling uses a 2582975 which is a 3 row with a shroud. Neither car has A/C.