On Tue, 29 Nov 1994, Stuart Hutton wrote: 

> > Martha: if you tell me what the silver socket is on the dash of
westies, > > I'll tell you what that silver thing is on the outside of
your van....DC -- > I am almost convinced that there is a good possibility
that that silver > socket is the plug for a seat heater, probably sold
only in Canada. > VW does not know what that thing is, but it's in my 82
diesel and it sparks > if you accidently stick the key in it. > Stuart
> 

I don t know what the socket is for, but I know BMW motorcycles use the 
same plug/socket for heated vests.  Try a cycle shop to get the matching plug

danno