I came across this

Here is where you can make it easy on yourself. Make a "sewing needle" out of some stiff wire. I used some spare solid core copper electrical wire I had laying around.It is flexible, but still stiff enough to do what I need. ( I plan to use a wire hanger ) Make a loop with your wire to form the eye of the needle. Slide the eye through the grommet, so that the loop is accessible. It helps to put a small amount of lubricant on the needle to aid in sliding it through (I used a thin film of Vaseline).
Pass several inches of the wire you are running through the eye of the needle.Pull back on the other end of the needle to easily pull the wire through the grommet. It will make short work out of fishing the wire through the grommet.

Pics here

http://shbox.com/fw/fw3.jpg

http://shbox.com/fw/fw4.jpg

http://shbox.com/fw/fw5.jpg


You can tie a string to one end of the wire and pull it through the grommet-them tie this sring to the wire you want to thread and pull it through. This is described here

1. If you do not have a 'fish' tool, make one up out of at least 2 feet of semi flexible wire. An old coat hanger will do. Make sure you bend both ends back on themselves so when you push it through the grommet it won't get punctured. Tie the 6 foot piece of strong string to one end of the fishing tool and put a piece of electrical tape over this end. Lubricate this 'tool' with vaseline or similar.
2. Working from the inside of the truck, feel for the grommet and start feeding the 'fish' through towards the door. You can help it along by feeling and shifting the 'accordian' part of the grommet with your other hand. Once you are through to the inside of the door. Pull the 'tool' and string through to the door and out the speaker opening but make sure you leave enough string on the inside of the truck so you can pull it back..
3. Untie the string from the 'fish' tool. Tie the string securely to the free end of the 8-wire bundle and tape it securely. You do not want it to accidentally pull off.
4. Lubricate the 8-wire bundle and pull it through the grommet to the inside of the truck.

I can only tell if this will work after I do this. It is supposed to be the toughest part of the job.

Professional fishing tools
http://www.howtowireahouse.com/Fiber...Push_Rods.html

http://www.howtowireahouse.com/Fiber...Push_Rods.html

http://www.howtowireahouse.com/Exten...Retriever.html