lockman1958:
The factory fit-up for the '65 GMC cab & dash and the '65 Chevy cab & dash are not the same. The dash assembly from either will fit the other, however the dash gauge or warning light clusters are not interchangeable. The cab itself, minus the dash and dash cluster (and the VIN) is the same in the '65 GMC and '65 Chevy. The '65 GMC dash has an eyebrow over the drivers side, whereas the '65 Chevy dash is the same height from A pillar to A pillar. I have one of each and can provide photos of each if interested.