If your number plate light unit is damaged then an alternative is to replace it with the neat unit below which bolts straight into the centre hole of our Totally TTRs tail tidy.
It features a "brow" on the lens to direct the beam downwards onto the number plate. Universal 6mm bolt fitting, 12V 1.4W, E-marked, size 2.6 x 1.8 x 1.7cm.
The photo below doesn't do it justice as I had mounted the number plate a bit high so the top corners aren't too well lit but you could fit your own number plate a bit lower to improve things.
The LED light has had its cables extendied and is ready to connect into your existing wiring loom as per the old tail light.