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The steering gear box & shaft only (no column tube parts or pitman arm) likely started life as an 11A part but the replacement for it was the 21A-3504 and was used from 1941 thru 1947. Casting numbers on the gear housing are likely individual part numbers for the casting. I'm not sure what changed for 1948 (likely the lock went away) but they all share the 11A-3524 steering shaft with the lock hole in it. There is a lot of interchangeability there.