http://www.tcpglobal.com/autocolorli...86-gm-pg11.jpg
Ok, I forgot along the line they grouped all of GM vehicles under General Motors and stopped the Chevrolet listing. They do have a chip chart for 86. "Commercial" covered all trucks, including fleet. I still say it's probably that code 87. Between the junky color chip quality, and a little bit of fade on your truck, just a guess.