This entire assembly for the early VW Beetle - Bus [mid '50s through '67] is available through many VW parts suppliers for about $45.
$45 gets you all that you see here; bucket with hole for parking lights, adjuster screws, rings etc..
Looks like the lens could be flipped 180 to look correct on an early Porsche. I have not tried this, just wanted to add the the convo..