Whilst fitting my H.I.D's I took plenty of pictures for my friend who also wants to do the same mod to his car.
I was going to submit this as a how-to but there are already how-to's in the how-to section and I wouldn't want to try and replace any of the guides that another member has clearly taken the time and effort to write. (Also I couldn't get the pictures down to the 100kb limit in order to post them on the site).
I purchased them from CARMODSHOP and when I came to fit them I decided to go for the method of removing the bumper and headlights and mounting the ballast underneath the headlight. Here's my efforts...
So basically I started off with my facelift Vectra, Bonnet Open.
I turned full lock on the wheel in order to gain access to the torx screws.
Using a T20 torx alan key I removed the 2 screws
I then turned full lock in the opposite direction in order to gain access to the torx screws on the opposite side
Again I used a T20 torx alan key to remove the 2 screws
Next up, using the same T20 alan key, I removed the 4 x Torx screws from the top of the bumper
Underneath the car there are 4 plastic push-type clips with a thin plastic rod going through them. Locate these 4 clips and, using pliers and a screwdriver, prise/pull the plastic rod in order to free the clip. (See Step 8 & 9)
This picture shows the thin plastic rod half removed
This picture shows all 4 plastic clips to try and show what they look like and how they work.
Although it doesn't feel natural, you need to give the bumper a firm pull in the direction shown in order to release it (best to pull outwards but place your hand towards the top of the bumper where the 1st arrow is located)
The bumper should come away nicely
Again, repeat step 10 but for the opposite side
The whole bumper should now be free and drop onto the floor
Before the bumper can be removed completely, ensure you disconnect the drivers side foglight
And the passenger side fog light
And the air temperature sensor
Next I removed the headlights, there are 2 x 8mm bolts on top
And 1 x 8mm bolt underneath
Before pulling away the headlight from the car ensure that this clip is removed, just pull the red tab
And it should come away like this
Your Vectra will look a little bit like this
In order to mount the ballast I located the space underneath the headlight which is already dedicated to the factory fitted xenons.
I made use of the pre-drilled holes and fitted 2 x self tappers
I then fitted the bulbs for the H.I.D's by first drilling a big enough hole in the headlight cover and feeding the wires through, all secured nicely with the grommet provided
Finally I mounted the ballast with double sided stickey foam and I ty-raped around the ballast and the self tappers to ensure I nice snug fit (this is not shown in the picture but basically I wrapped the ty-rap around the 2 self tappers and around the ballast)