Shop › Model T Exhaust Nut Wrench (crow's foot) Image 1 of 1 Model T Exhaust Nut Wrench (crow's foot) $20.00 The crows-foot wrench will work with a 3/8” wrench on an original or aftermarket exhaust packing nut. Quantity: Add To Cart Added! The crows-foot wrench will work with a 3/8” wrench on an original or aftermarket exhaust packing nut.