Pull the wiring through to the grommet.
It's really pretty easy to squeeze the outside (smaller) part of the grommet through the cover hole and get it sealed properly.
Here is the inside when it is done.
And here is the outside when you are finished.
Of course, you have removed the OEM H7 bulbs, and I've skipped taking pictures of me putting the HID bulds in the housing. (It was too hectic at the time and I just forgot).
You need to know that the the thickness of the round mounting plate on the ends of the HID are at least 3 times thicker than the OEM bulbs (plastic vs. metal) so you will need to carefully
bend each of the three tabs backwards, and make the center tab rise higher to hold the bulb firmly.
I am SO glad I took the whole front fairing off the bike at this step. You can read about others who have broke the metal tabs, or had their HID bulbs fall out after mounting, or even ended up in the mounts all crooked. Not mine. They are in there solid baby, because I could work on it much better than on the bike.
It goes without saying, don't touch the bulbs. Keep them free of greasy fingers and wipe them down with alcohol before final mounting.
Check out the picture below. The flat bladed red and black wires inside the cover are inserted into the appropriate side of the power block that used to be placed on the end of the OEM H7 bulb.
Then, the connector block is settled back down into available space inside the housing.
Be careful how you do this.
There are bare metal tabs inside the housing, and you don't want to make contact with them with your "nearly" insulated power wires in there.
As you put the cover back on, make sure you carefully pull on each of the 4 wires as you get the cover locked back down. That makes sure you have enough remaining wire outside the cover, and not too much left inside.
You will find that if the cover needs to come off again, it's easy to reverse how much of the wire needs to be where.
Now you are ready to mount the ballasts and igniters.
Besides asking where you are going to mount them, ask yourself what are you going to use? Duct Tape (looks ugly). Super glue (too permanant).
I chose the "5 lb." outdoor
type double sided tape shown below from Scotch 3M. I picked up a roll at Lowes Hardware. I think it was $5 - $8. Hopefully it will work for a long time. It's nice and thick to meld over imperfections in shape.
The bottom of my ballasts (and igniter) aren't that smooth, so a product like this seems to fill the voids well.