relay problems!!!!!

[bussbloke]

Hope someone on here can help, I have a 2.0ltr fuel injected air cooled engine in my bus, engine number CA 025884 002. the relay on the fuel injection has gone[part no 071 906 059A] We ordered a replacement from Heritage, which when it arrived had 11 pins. The one on my bus has 13 pins, does anyone have any idea where i could get a 13 pin replacement or where i could get a wiring diagram from for an electrician to look at. Any help or suggestions would be most welcome, thanks