I wish the resto packs had more specific information about this stuff (deluxe options, colors, etc). Isn't that supposed to be the purpose of these packs? Unfortunately, some of them are lacking in some areas, and one has to resort to searching through other resources. That's true at least for '53 and '54, which are the packs I have. Some of the earlier packs may have been more complete. I know the '49 pack has a nice chart giving the colors of all the exterior components.
One other note about hubcap color. The January, 1953 issue of "Chevrolet Service News" has a chart of '53 truck color specs. It says the hubcaps were Anvil Gray (same as the front bumper), not Thistle Gray, though Thistle was used--on the grill inner bars.