Hello, i have just finished replacing mine!! you are correct there are the only the 2 front/2 rear bolts. Mine was however still very stiff just because of the seals on the 4 air pipes going into the engine. there is also a very stiff breather hose between the air box(right hand side) and the rocker cover that needs removing and the glow plug live cable is connected to a stud on the air box (lower right hand side). I hope all this helps
Rich, January 2008