Triumph Dual Carb Conversion Intake Manifolds. Convert single carb heads into Twin carb. 
Dual carburetor adapters fit all 650 pre unit & unit construction single carburetor heads. Also fits TR 750 heads and iron head 500cc pre unit heads.
 Adapters are high quality toughened heat treated aluminum castings.
Once you have installed manifolds, take a moment to inspect the fit and alignment of intake tract with head and carburetor. Congratulate yourself on purchasing the best.