Unplug one side HID unit, plug in a normal H4 bulb and see if the flickering still occurs, if it does the car is at fault, if not the HIDs are duff, simple and no fancy knowledge needed. Do not lean the H4 bulb against anything soft/plastic as...

I know there is only 4 glow plugs, but starting on 4! To the op, remove the air filter trunking and have a listen when you start it.

That is a casting number, and not an engine number. You could try a little acid on where the engine number should be and see if anything shows up. Any pics of your pump and the incorrect pumps?

Hbrake cable is the thing that runs through the hook attached to the lower arm.

Year of car will help, and when you state replace brakes, do you mean pads/shoes or calipers as well?

What year? Pre 07 fit blanks/remove throttle plate and carry on, later cars more work.