Was the csl build number! Not sure if this photo works for you but in red is A48. A few years ago when we were all discussing build numbers and it was related to your vin number, ours was #48 which seems to be confirmed here. Has anyone else noticed this too?
You can see a pic at this link as I can't for the life of me, seem to add a photo to this post.
https://ibb.co/kE6Oyk
Had new kick plates fitted today in readiness for a car show this Sunday
