Building regulations require a certain number of energy efficient lights to be fitted.

A number of different wings can be fitted, including the Top 12.9.

A number of piers were fitted with rail lines to carry goods from the ship to the mainland.

K4s numbers 3676, 5399, and 5436 were fitted with booster engines on the trailing trucks in 1941.

A number of road locomotives are fitted with a crane boom on the front.

Sugar packs were sized so a number of them could be fitted into an airborne parachute container.

A number of the replicas were fitted with motorcycle engines to enable them to taxi.

A number of different wings and engines can be fitted to create several variants.

A number of different wings can be fitted to the basic carriage, but the Star 12 was formerly the standard wing offered.

A substantial number were fitted with rockets and bombs.