1979-04 Mustang Stifflers Lower Chassis Brace for Aftermarket Tubular K members. Will clear  Longtubes  http://buystifflers.com/lowerchassisbrace79-04mustangtubularkmember7904.aspx - 1979-04 Mustang Stifflers Lower Chassis Brace for Aftermarket Tubular K members. Will clear Longtubes