Joe,
Bruce has nicely described the under-hood colors.
However, I think that a belt-line pinstripe was available for all Advance Design trucks.
Here are the exterior color and pinstripe combinations for 1954 Chevrolet trucks. This topic was recently
discussed/argued in a recent post/thread. Pearl Beige interior color and Cream Medium stripe colors are noticeably different. The Pearl Beige is lighter than the Cream Medium (there is a "buttery-cream" appearance to Cream Medium).
I have never seen paint chips for Pearl Beige but
Cream Medium is shown on this Dupont paint sheet.. Note that the paint sheet colors are not very "true" due to 50+ years of aging, and distortion from scanning, screen-display, and web-colors.
Tim