South Western Model Company’s F Unit roof top coils “Dynamic Hatch Set (4 versions)” has been added to your cart. View cart $6.00 South Western Model Company's F Unit roof top coils quantity Add to cart SKU: DHRTC Category: Plastic Parts Related products Exhaust Stacks (4) and Steam Generator Vents (early) $7.00 $7.00 Add to cart Headlamp reflectors (pair) $8.00 Add to cart A Unit, shell only $25.00 Add to cart Winterization Hatch & Late Style Steam Generator Vent $8.00 Add to cart