I cannot see the need to add any relays or wires to the existing circuits
The existing 01 to 04 lights have a single twin filiment bulb and is replaced with two separate bulbs on the 04/05 lamps.
On the 01/04 cars the wiring on the LHS has a red/yellow feed via a relay in the fuse box to both bulbs positive+ and is switched on the earth - via the red and white wire for low beam and via a red and blue wire for high beam.
The RHS lamp has a red feed wire via a relay in the fuse box and is switched on the low beam to earth via the red and white wire and on the high beam via a red and blue wire.
To wire in the new lamps[/b]: LHS lamp, feed the positive side of each bulb holder from the red wire and connect the red/white wire to the negative side of the low beam bulb and the red and blue wire to the negative side of the high beam bulb.
For the RHD lamp: feed the red wire to each positive side of each bulb holder and the red and white wire to the negative side of the low beam bulb and the red and blue to the negative side of the high beam bulb.
Hey presto!! Couldn't be simpler, could it??/?? I haven't tried it but it works on paper. Will try it ASAP and post.