Working square motors can be quite expensive if you need a fully functioning one. I'm sorry that I can't offer a spare but you may find that you can buy a used one off eBay since all you need is the electrical portion. Don't forget to branch out and consider other marques as donors (MGs, Sunbeams, etc.) Be aware however, that there are several different square motor types. Examine them carefully to make sure they are the same series as what you need the electrics for. I believe the type (and the production date) are stamped on the cover for the gear and slider.