In the early years 60-63, I would use tclederman's info stating "Silver Gray Metallic" for most of inside of cab and Charcoal Metallic for top of dash (anti-glare).
J. Carter has the paint for 64-66. I believe this paint was called Fawn. Some of those 64-66 interiors used a two tone fawn. (see 65 dated/ 66 brochure pic, second paragraph)......... medium fawn and dark fawn.
You can take the glove box door to a paint shop and have them match the INSIDE, which sees very little sun.....or door panel under arm rest mounting.