http://www.ebay.com/itm/1-2-in-Brai...t=Car_Audio_Video&hash=item3cdd3e06bd&vxp=mtr
I'm using this right now and it works and looks awesome. Much better looking than taped up wiring unless your doing a stock/factory OEM correct resto.
Whats nice is you can pull wires out the side as you go along and you don't have to tape it.