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I used rubber grommets available from the local hardware store. Drill the holes where you're going to run the wires through the door and the pillar. Install the grommets with a light coating of grease where the wires will come into contact with the grommets.
You don't need that bulky tubing for speaker wires. Just buy some shrink tubing, run the wires through the tubing and heat it with a hair dryer or heat gun. This will protect the insulation on the wires and prevent chaffing. Very simple and effective way to run wires into the doors.
Total cost...about $10 US including the speaker wire.
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