For sale is a set of steel wheeels known as flapper wheels or mud and sand wheels . They mount outboard of the rubber tires and are just a bit smaller in diameter to the rear rubber tires on a 8 N. I have all mounting hardware plus the wheels all are in very good shape and I am told they are quite rare . Call 716-694-4574 or email for more info and I will send you pictures / I am located outside Buffalo NY