Early AD pickups thru '52 used a color called Medium Tan Metallichrome, a semi gloss, slightly metallic color. In 53, GM went to a color called Sheen Gray Poly, and in 54-55 a color called Pearl Gray
Here are a couple of photos of repainted doors that are real close to the original color for 47-52. I bought from Jim Carter and needed to lighten it a bit to match the original parts on my truck that still had paint on them. The two pics had a bit different lighting so look different.
Like Phil said, any truck interior painted exterior color wasn't factory.
