Though the degree of cooperation differs between alliances, airlines alliance is more helpful for small airlines. There are three major international airline alliances namely SkyTeam, Star Alliance and Oneworld. One of the modern alliances is that formed by cargo airlines.
The top terminal should be connected to wire #18 (low beam), the bottom right to wire #17 (high beam), and the bottom left to wire #91 (headlight to ground). I purchased my lights from a local shop, but I found that Susquehanna Motorsports has a web page with competitive prices and a nice write up about the lights.
What does beam angle mean? The beam angle of a lamp is the angle at which light is emitted. As a reference a standard halogen GU10 bulb will use a beam angle of some 38 degrees. Within limits it doesn't make much difference if the beam angles are slightly different - for example you would be unlikely to notice the difference bewtween 35 and 38 degrees.