I took some rough measurements off a couple of trucks today.
The 53 GMC (GVW=16,000) was approx 72 inches between the inner lips of the two front fenders at the highest point of the fender opening.
The mid 80s Chevy 30 series was approx 74 inches from the outer sidewall to outer sidewall of the two front tires.
The mid 90s Chevy 3500 series dually was approx 74 inches from outer sidewall to outer sidewall of the two front tires.
The outside of the front fenders on the 80s and 90s Chevys were about even with the outside of the tire sidewalls.
When I leave work tomorrow I'll grab a 4 foot level so I can accurately mark and measure these items again and I will correct this post for posterity.
