SEARCH is your friend. Rather than go over it all again, look here (has photos) ........
http://www.alfabb.com/bb/forums/show...dlight+buckets
Just to clarify; H4 is the designation for the BULB. You will need to source 5-3/4" generic aftermarket light glasses to fit into the buckets, and the glass will accept an appropriate bulb (H1, H3, H4). The Hx designator of the bulb denotes the shape of its base, and whether it has one or two filaments. It does not designate the wattage of the bulb.
As the factory H1 (or is it H3 ?) is single filament it will be designated something like H1-55w. A H4 being twin filament will read something like H4-55/80w. ie 55watts low beam, 85watts high beam.
Alternatively, you could fit sealed-beam lights, which are glass-and-globe all in one unit.
I think the best setup, if you are modifying the headlights, is to use H4s in the outer lights, suitably relayed to give
high and
low beam, then set the inner lights up purely with driving/spot lights (suitably relayed). Have the spots separately switched from the cabin so you can turn the spots off with high beam (a legal requirement in Australia anyway).