In the 2.8L Volvo the engine is traversed and the 2.9L is inline I have a 2001 2.9L Traversed what gives?

I don't know but I do know information and vehicle specifications do tend to vary from territory to territory and while the handbook supplied with the vehicle should be accurate it can't be guaranteed.

The local dealer is the best and most reliable source of information and in all cases of doubt they should be consulted. The information possessed by the aftermarket is often incomplete.