Barrie, I'm happy to join you in Pedants Corner on this car, AE 65, which I think is one of the most accurately preserved/restored early Aces I've seen. So many features to note - in addition to the original over riders with their special brackets, the 'Monza' fuel filler and the Lucas reflectors on the boot either side of the number plate, to name but two. The interior and under the bonnet are also areas where Thames Ditton originality is still very accurately reflected. You are of course correct in observing that the original (tiny) L488 rear lights have been replaced by red versions of the Lucas L539 - the modification made clearly to offer a little more illumination with safety in mind. At least the car has not been modified to fit the later rectangular L542 (used from 1955 to the end of 427 production), as has happened with many very early cars. The budget lock on the boot? Certainly still operated by the bonnet 'T' key at this stage in Ace production, but the tear shaped cover? You are right, probably not.
Whatever! None of which helps identify those early over riders. Surely they will have been used by other cars and not been manufactured specially by AC cars? Tim