The dimensions didn't show up correctly above, and can't find the edit button. So here I go again

Our trucks 258mm OD, 33.5mm height, 22mm thickness, 84mm centre hole diameter
Econovan 275mm OD, 33mm height, 20mm thickness, 85mm centre hole diameter (all pretty close)
Feroza 277mm OD, 33mm height, 18mm thickness, 96mm centre hole diameter (too big?)
Merc 276mm OD, 35.5mm height, 22mm thickness, 67mm centre hole (would need boring out to 84mm)