Based on the 1929-1948 Chevrolet Master Parts Catalog, part number 3654573 is a "Bracket, tube". At that time it cost $0.12 and one was used on all passenger (no mention of commercial, utility or COE using them) from 1940-1948. 3654573 is listed in parts group 8.077 Bracket-Grommet-Guide--Clip, Hood Catch Control Rod Tube.
They might also have been used later as 1948 is the last year covered in the particular catalog. As speculation, later uses might have been for other applications than the hood catch (civilian vehicles) or cowl ventilators (CMP).
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