This is how i did mine, ill try and explain as best as possible lol
I ran my wires satrting outside the door speaker mount, into the speaker mount/hole and into this rubber piping grommet, then halfway through make a small hole so you can poke the wire out. At this point you wire will be into the door up part of thet grommet then poking out.
Now if you look in between the car and door just above where the 'pipe' grommet is ther is another large standard circle grommet. make a hole again in this and feed the wire through. internally this grommet is found just above the bonnet catch lever, through the inner body skin (youll know what i mean).
You should now have the wire leading from the door into the car

just run the leads under the trim to the rear and your done!
These are good grommets and a good thickness so making a small hole will not let water in as the wire will fit tightly! Good luck!