PART NO.  SPL.PAGE  DESCRIPTION                                                           
AEC340    sup.4     Washer -locking -screw -(tensioner, engine unit, sup)
AEC340    16.A.4    Washer -locking -screw -(tensioner, engine unit, 1600)
AEC340    16.A.25   Washer -lock -screw -(tensioner, engine unit, 1622)

The AEC340 locktab is used to secure the screws for the engine timing chain tensioner.

We now have an additional use for this part. It can be cut in half to make two 1B3363 locktabs for the gearbox reverse gear shaft locking screw (as that part has been unavailable for some time).