Aircooled VW South Africa

I’m in the process of upgrading the headlights on my 64 Beetle (12v) and looking for some advice. Currently I have pre60 Bosch units which is wrong for the year but never bothered me much. The new reflectors/ mirrors I bought doesn’t fit as the adjusting screws are in a different position.

So I found complete units to replace them with but realised the mounting screws are different - and missing the tab. I have a set of new rings but wanted to check what these are for before I start taking them apart...





Thanks,
Gerhard