There was a change made to the hinges at some point. The hinges in my '47 have all 3/8" holes. The shoulder bolt kit that i ordered from one of the vendors came with 2) 3/8" and 4) 7/16". You want to get a shoulder bolt kit for your new hinges.

1947.2 Chevy Panel Truck 1-ton
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1955.2 Chevy Suburban
1955.2 Chevy 6700 Bus/RV