Until 1961, the tail lights of the VW Beetles were screwed to the mudguard using a separate bracket. The holder also served as a conductor for the electrical ground of the lamp socket.
If you are going to buy a new rear light (listed under the related tab), you will need to order this additional bracket, it is not included.
Useful information from Paruzzi magazine and from our YouTube channel :
Look for more technical articles on the page Paruzzi Magazine