So does anyone have the answer to this ?

I have a MC28 which uses the same bulb as the MC21 and I managed to crack one of my bulbs. I was planning to just order a bulb the next time I go to Japan (I go there every year at least once), but if I could find it in the US it would be nice.

Alternatively I heard someone did a "H4" mod to his housing. Anyone know anything about this?