Hello John,
Have been pondering this for a while for my 2011 Roadster.
Having driven at night I did not think my headlights good enough, even with "nightbreaker" bulbs.
Neither did I wish to drill the bodywork as I have an expensive paint system which even the Morgan Main Agent would not drill!
So I started looking for other mounting arrangements for a pair of driving lights. For me the 5 ins (Wipac S6066 - one option)were the least obtrusive to the clean lines of the car.
One Morgan owner has made up a pair of brackets fixed to the overrider bolts, and the Burghi bar from Italy is the other option. This is not a badge bar (which would vibrate) but is fixed to each overrider for added stability. Of course this means drilling a hole in each overrider.
If you need more info, email me on davidharris144@btinternet.com
Good Luck