where do I send wires into cab?

HELP! I'm wiring up my rigid industries LED Dully lights. I have them mounted to a BAMF behind the grille light bar. all I need help with is how or where to slide the wiring into the cab of my truck. I know that there is that hole near the parking break that has a rubber holder but I cant get it out and I dont want to damage anything of the wiring with in that rubber holder. I can slip the wiring around the outside of that rubber piece but then I would run the risk of cutting or tearing the wire harness im trying add.

ANY HELP WOULD BE APPRECIATED!!!

 

bump

 

use an awl and poke a little hole in that rubber boot... will work fine. that is the easiest way to pass wires through the firewall.

 

13 minute bump?

Run it through where the rest of the wires go in on the drivers side of the engine bay through the rubber boot. Sent my power cable for my amp through there.

 

+1
All my wires run through there. Amp, Antenna Cable, Warning light wires

Use a wire hanger or fish tape to help pull wires htrough