Help with bounds

Ive only been using blender 2.48a for a week now so i dont no alot, but im using a tutorial for vehicle physics and it tells me to set the bounds to convex hull polytope but i cant find it, it just says convex hull, can anyone tell me why please.

I don’t recall if that is an antiquated menu entry, but convex hull is the right thing. I think convex hull implies polytope, so it was a redundant menu entry?