The cables are call EXTENDER CABLES. I think mine were $15.00 each, but its been a while back.
There is a hole under the PM where the cables can enter the car.
Look under the dash, above and to the right of the fuse block.
I did this and I should have removed the wires from the black plastic tube when going thru the firewall and then re-installed them.
Keep the rubber grommet and re-install it. You may need to make the inside hole just a little bigger. Also after you get it back end use some silicone around the wires to keep the engine fumes out of the car.