Hi David
welcome to pinside. Lately - in another topic another pinsider showed this http://pinballmike.com/ In the upper right corner I click on "Pinball Schematics & Manuals" --- Williams EM --- and here http://pinballmike.com/pinball_schematics_williams_em.asp?page=11 they offer "Williams Four Star". Here http://pinballmike.com/order_info.asp they write about shipping outside USA / Canada they will charge ten dollars ...
I do not know the company - have never bought from. Greetings Rolf