At first I thought maybe a Canadian truck fender, but checking a 1955-57 Canadian Chevy/GMC parts book, no match found. Could be something from another export market, but nothing I could find with a short web check.

Below is a comparison shot of your pic and a currently offered AMD repop 1955-57 pickup front fender advertisement picture. The repop seems to be similar with yours in the length at the bottom front of the fender, but very hard to do a thorough comparison without a physical side by side check.

Is your left side fender the same as this one???
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~ Dan
1951 Chevy 3 window 3100
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"My Grandpa Carl's Truck and How it Became Mine"
1966 Chevelle (Wife's Hot Rod) | 2013 Chevy Silverado (Current daily driver)
US Army MSG Retired (1977-1998) | Com Fac Maint Lead Tech Retired (1998-2021)