I have a set of electric seats from a later disco to fit in my 1995 300TDI. I was fortunate enough to remove these from the newer disco, and all the looms seemed to originate from the center console, with 4 relays located under the passenger seat.
I have yet to find any spare connectors in my Disco for either the seat wiring, or the switch wiring in the console. i have had the carpets up, and looked as best i can in the console, without yet taking it out.
Hope this helps :?