Section 16 Machinery and mechanical appliances; electrical equipment; parts thereof; sound recorders and reproducers, television image and sound recorders and reproducers,and parts and accessories of such articles 84 Nuclear reactors, boilers, machinery and mechanical appliances; parts thereof 84 09 Parts suitable for use with engines of 84.07 or 84.08 84 09 91 Suitable for engines used on vehicles of Chapter 87 84 09 91 ** Suitable for engines used on vehicles of Chapter 87 Commodity Code Description 84 09 91 10 000 Suitable for engines used on vehicles of Chapter 87 84 09 91 90 000 Suitable for use solely or principally with spark-ignition internal combustion piston ..