Number Board Sets “B Unit, shell only” has been added to your cart. View cart $8.00 Number Board Sets quantity Add to cart SKU: 3102 Category: Plastic Parts Related products South Western Model Company’s F Unit roof top coils $6.00 Add to cart Sand Filler Hatches $7.00 Add to cart B Unit, shell only $23.00 Add to cart Dynamic Hatch Set (4 versions) $8.00 Add to cart