Modifying H3 bulb to work in place of H3C?

[kazuo]

Couldn't find anything in the search... maybe its cus I suck.

But this should probably be archived once the answer is made clear.

S13 Silvia headlights use H3C in several applications... on the Dual Projector housings, its used on the lowbeam and I think the fogs, and on the Triple Projector housing, its used on the fogs as well (thankfully, the low beam is a H1).

Now then, I understand H3 can work in place of H3C with slight modification. I dont want to screw anything up figuring it out, so does anyone have any idea what needs to be done to make it work?

FYI, H3C is only available in Japan, so this is why I would like to clarify this.

Thanks