The factory stuff is kind of a tar like material. If you don't care about original look to can just use some duct tape.
If you want something like the original then find an electrical supply business that supplies to electricians. There is a material that is used for sealing conduet that is very close to the factory stuff.
Here is a link that you can use to ask for it. It's a tacky tar like material that stays sticky. Just make sure the surfaces are dry and clean. It does not like to stick to dust and dirt. Warm it up, roll it out in worms and smash it on. http://www.cableorganizer.c...er-bender/duct-seal/
[This message has been edited by Dodgerunner (edited 03-29-2014).]