First of all, relax. You will live longer.
If you had used Banditmania you would have received the loom.
You don't really need the loom anyway because Suzuki were kind enough to supply about 10 feet of extra wiring in the front of their 2G Bandits.
You have two options regarding the wiring, that being bullet connectors or soldering. The "loom" provided was simply some wiring with connectors clamped on the ends inside some heatshrink. No great loss if you did not get it.
When you are pulling apart the front end on your bike just chase the wires to the lights as you remove them and put a tag on the wire telling you what it did, ie indicators, high beam etc. From memory the wires coming out of the headlights are green/black, blue, white, brown. Get rid of the brown one as that is useless, I just shoved it back into the headlight assy just in case.
Because the new lights are both high/low beam instead of one high one low as how the bandit is set up you will have to splice the yellow and white wires so they go to each headlight.
So green/black on headlight goes to black/white on bike, blue on headlight goes to yellow on bike and white on headlight goes to white on bike.
The 5 3/4" headlights are fitted with halogen globes whereas the 4 1/2" arent.