The Chevy Master Parts Books list that as Group 8.855, GM# 5047709 fitting 1947 (your current dated heater) through 1955.1 Series truck "air flow" heaters. The number was later (05/66) replaced by GM# 5047731, which was originally specified for 1949-54 passenger car "air flow" applications. Same motor either way.
Edit Note: There is an NOS GM# 5047731 currently offered on evilbay.
Last edited by Gdads51; 10/03/20262:19 PM. Reason: add Edit Note
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