Here is another great resource, very nice lights.
Daniel Stern can be a little blunt when you write him, but he knows pretty much all there is to know. You can tell him what needs you have, and you can tell you what will fit the bill. Advice about beam pattern, size, and wiring needs will be discussed. You have to write him anyway because he will not sell anything from a "shopping cart" as he prefers to help guide the customer to make sure they are getting what they will need. He also sells very nice replacements for the main Hi/Lo beam headlights.
http://danielsternlighting.com/products/products.html