Here is what I did, after more than a year of researching the correct color for the interior of my 52. I ordered a quart of the "correct" paint from Jim Carters. Once I got the paint I did a spray out sheet, and matched that to the 3 remaining original spots of paint in the cab. It was very close, and I liked the look of the paint. So I took a sample of paint and the spray out sheet to the good folks at Hightower paint supply here locally. I told them take there time and match the paint as close as possible. After two weeks they called and said come take alook. They had matched the paint almost exactly. I ordered a gallon ( I paid less that 1/2 for the gallon than the quart) Had them mix them together. I know 5 quarts is a lot, but this was my first time painting a vehicle. It turned out very well indeed. Also I didn't use a hardener, as I wanted a flatter finish. Also as a side note the original can got wet and the lable peeled off. Underneath the Carter lable was a Sherwin Williams lable. No code or name of the paint, but maybe an avenue to explore.