I must admit I like to play at "number plates" also!
OSU 424 I've had for years and use on my own Morgans. It's an old Renfrewshire registration (where I was born many, many years ago!) with symetrical even numbers..if you know what I mean? Now going on my "new" +8 Moss box.
AR08 RPM on my Aero demo
Y100 MOG on the RPM van
SP08TEE on my wife's 4/4 Sport (now nicknamed Sporty...that's the car, not the wife!!)
