Is 2276848 a valid P/N for a radiator for a '63 Polara 500 Max Wedge? I've seen posted here that 2276844 is valid. What's the difference between an A/C and non-A/C radiator? Thanks for any info. - Jim Jim Altemose, Long Island, NY '63 Polara 500 (Max Wedge), '65 Belvedere I (Street Wedge), '71 Bronco