[pugs]

well your cab is a gmc. its not really a vin but a serial number. Is there a tag on the driver side door jam between the hinges.. if the numbers match your good. now its possible its a 57 and maybe in the past the front clip was changed out for some reason or it is a 58 but was sold in 57 so there for titled as a 57. let us know what the numbers are and I or someone will chime in and let ya know what it is