Thanks, y'all. Chris, is that a new number for the '86 petcock, or the number for the petcock they started putting on after that? If you don't know off-hand don't worry about it, I'll ask the folks at your link.
The '86 version had on, reserve, and prime while the later models had on, reserve, and off. Also, the '86 version had a one-piece plastic intake that fit securly into the petcock body...a setup I like a lot better than that on the later models I've installed. What I'd really like is an '86 version but with off instead of prime. (o;}