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I finally solved this. I never found a bulb pinout, but I found a technical page from one of the manufacturers of these standard bulbs. It has a diagram showing that the lower of the two filaments is the high beam. So I put the bulb in the socket, and then pressed the the low beam wire (the white one) to each contact, which separately lit each filament. I then knew the contact opposite the green ground wire for the high beam. I then soldered the blue and white wires back on the socket. (I knew the blue wire was for the high beam, because that was mentioned in several posts I came across while searching for a pinout.)
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