The green/white foam adhesive pads in the baggie are the exact size needed to place on the back of the thin 35W ballats. No cutting or trimming is required. I put the green side to the ballast, and the white side to the car.

On the other hand both the capacitors and the ignitors take some custom cutting of the other white/yellow foam adhesive pads.
Measure and use a good scissors to cut the other foam adhesive pad for the ignitors first (one thickness will do). Then cut two pieces the size needed to fit "in" the capacitor's base. It will take two layers to fill the slightly concave dimension of the base so that the adhesive surface will contact and "stick" to the wheel well (or wherever you chose to mount the capacitor). This pictures below show how I chose to mount each piece on the wheel well of of the passenger side. And the driver's side. Ok... so I'm not that good at pre-planning!
Passenger side...
Driver's side...
Now as to the connections:
This shows the male end of the OEM power connector (removed from the Halogen bulb) with its security clip on the upper side.
"Normally" you would think to connect this to the corresonding female end of the capacitor so that the security tab mates with the clip. HOWEVER... if you put it together this way, the lights will NOT work! They won't even give a flick! LOL
Fortunately, the contact pins within the power connector are not keyed to a particular orientation for the coupling. So the easy “fix” is simply to put the coupling together backwards, i.e., the security clip and the security pins on opposite sides.
For the purist, however, reverse the wires in the capacitor's female connector and then hook up the coupling normally.
Refering to the previous pictures...
The male connector from the capacitor then attaches normally to the female connector of the ballast, security clip to security tab. And the two connectors from the ignitor connect to the corresponding connectors of the HID bulb. They will only connect one way. The ignitor is hardwired to the ballast so there is “user” connecting with that.
It really is as "simple" as that! You're DONE.
Now for a few more pictures... in the next post...