This write-up is for the regular size 4000's but the design is very similar Hella 4000 HID Conversion | race-deZert http://www.toyota-4runner.org/3rd-g...ealed-hid-factory-fog-lights.html#post1437681
Beam-wise,I'd go with driving reflectors.
EDIT: started reading your build thread,guess you already know about taking apart those HID bulb terminals![]()