As was already mentioned, the correct size is Group 1. The NAPA 6V Commercial battery, PN 7244, is a rebranded DEKA battery, made by East Penn Manufacturing (same as their PN 901MF). I have the NAPA-branded battery in my '53 and it has given good service for the past 2 years (so far!).

Last edited by drdoug; 04/10/2019 9:18 PM.
1947 2nd-Series GMC FC152 3/4-ton
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1953 Chevy Bel Air Sport Coupe Powerglide