I haven't touched my dizzy bolts in years, but I remember the slant using a 7/16" instead of the more common 1/2. I also never needed a special wrench just always shoved my arm down there and gave it a turn. I would like to point out in case you are not aware the slant dizzy has two bolts, 1 on the block and 1 on the underside of the dizzy. They must both be tight are or it will move, but both are slotted and you only need to loosen one to turn the dizzy.