I too recently wondered about this. An online (ad?) made me wonder.

Van-cafe shows only one and vagcat.com ETKA shows ignition switch part
number 111905865L for 1980, 1987, 1990 under 1968-1992 Type 2 and PN
111953631 for wire terminal plastic housing.

I assume the differences are limited to the wires to-from the switch.

Neil.

On 5/19/14, Marc Perdue <mcperdue@gmail.com> wrote:

>.... I was
> wondering if there's a way to know which switch your van uses without
> looking at it. There seem to be a couple of different ones. I was thinking
> about ordering a switch for a backup, but my van's not here. It's an '87
> Westfalia, auto, no A/C, in case that stuff makes a difference.

--
Neil n

Blog: tubaneil.blogspot.ca

'88 Westy http://tinyurl.com/c8rlw6p

'81 VanaJetta 2.0 "Jaco"  http://tubaneil.googlepages.com/

Vanagon VAG *Gas* inline-VR Engine Swap Group:

http://tinyurl.com/d7gd5ej