OEM Honda small reflector - measures aprox 1.6" diameter. These have a metal base - not cheap plastic. They are a newer version and the bolt on the back is slightly longer than needed - so a little trimming might be necessary.
THIS IS A M5 thread.
Fits Honda Z50 K0-K2, some Z50 K3, and CT70K0 models.
Sold as each - you will need two per bike.