There aren't that many differences. 47-48 (some) had the fuel tank under the bed, later was in the cab. 51 introduced the wing vents and was the last year for the turn-down door handles. 52 had push button door handles, 90 mph speedo and the hood emblem didn't have the series numbers, just the word Chevrolet. In 53 the hood emblem went to numbers only. 54 and 55 first series have several changes, the easiest to spot are the parking lights were moved from the grill to the fenders, and the grill went to "fat" bars. Most items will interchange between any of the years.
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