The H3 adaptor is made by Rich Johnson
a914guy@aol.com. It does not require any modification of the lenses or reflectors, or anything at all in the light. Except for the power supply wire, which must come out of the barrel-type fitting it is screwed into, and an insulated spade lug must be crimped on. That's it--the rest is simply plug and play. The change is quite reversible if you decide to go back to stock, except that you'll have to cut off the spade lug and strip off a little more wire to have it fit back in the barrel connector.
--DD