Another vote for Classic Car LEDs
I've put LEDs in the Morgan and the Landy, with the exception of the indicators on both and the headlights on the Morgan, as I'm not sure whether you could fit the H4 replacements into the headlamp bowls, even the ones with the remote gubbins. The standard ones like I put on the Landy certainly wouldn't fit.
If anyone's done the headlights, I'd be interested which ones they went for.