G508 - As far as I know, the drip rails from any 1941-46 GMC or Chevy truck cab should fit your '42 GMC cab. A quick search of vendors shows no one currently offering replacement drip rails for 1941-46 Chevy or GMC trucks.

Your best bet is probably going to be finding a donor cab with intact drip rails I think.


~ 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)