I have a different way of putting on HID coversions.  I ordered GE 880 bulb conversion kits for auto applications, and put them right in the factory housings on the front beltline and rear top of cab lights on our 7210's.  They have a ballast and just plug in to the spade connector on the tractor.  I have some on a 1998 7210, and the lenses seem to throw a flood pattern, but on the 1999 7210 it has "Grote" lenses and they are more of a trapezoid pattern.  The floods have a more useful light pattern.  I got the idea from a post on here, but can't remember the posters call name.  They were only thirty bucks a light.  Have had good luck with them so far.  The website I got them from was www.vvme.com

I got the 6000K 880's.