Find an autobody paint store, take a piece with you. More apt to find somebody to take a little time, look up some chips, do a little tinting. 30 y/o faded stuff can be hard to match. I've tinted and mixed tons of paint and sometimes it's best to have the piece and color books find the closest chip you can, mix, and tint it. I know PPG and Dupont both have vinyl dyes, but I'm not sure if they can computer match it like paint colors.