Some models(X5, X6) were offered in a short wheel base and long one (2up). I don't think the X8 was offered in a short one, so all of them are 2ups. The service manual here should work for you. Just get the X8 users manual, if you need one. Check your vin and make sure you have a 2012. I think there is a tread somewhere here that lists the code for the years.