Nice to see that page posted above by chengny!
Not that you need it here, and not easy to use, but I have looked up all kinds of OE part numbers for my 82 C10 at GMpartsWiki.com, and found a few by googling them. Actually bought one part from a Buick dealer on the east cost, and another from a Corvette parts company.
FYI, RockAuto.com shows ATP #Y267 and Pioneer #CA8500 for 86 K10 with 350. The GM number referenced is 25515839. I have found Pioneer products in general to be pretty good quality.
Interesting that the Ac Delco catalog shows the TV cable but not the accelerator cable. ???