The oem coil will not run a dual headlight system...even if you have 25watters in it (they come with 35watters. Well, my acerbis did).
Elextrex is on the web. The 'rating' of their unit changes depending on whose label you read. It's either 65 or 70 watts. That is the unit that comes from moose (last I checked).
Rickystator is another option. He's on the web, too.
The lights come in a variety of angles. A suggestion: Run one narrow, one wide beam. 25W bulbs run only a few bucks (from steahlyoffroad anyway. No, I don't order from chuck...I drive down the street and buy them all by myself. He's on the web, too. I'm sure he'd be more'n glad to send you anything he's got!).
re: dim/dimmer/out Ha! Yep..those lucas systems were great, 'eh?