Hi
I had to buy RHD drive ones from these people
http://www.design911.com/
911 headlights fit in any headlight bucket that a 6 volt Bettle headlight fits onto.
You have a few options, chrome ring 911 lights, or the later ones which have a paintable cover.
I prefer the 911 lights over early Beetle headlights as the 911 lights dont have the Herman Munster attcahing bolt.
Steve