58 Buick firewall grommet HELP

Hi all, well I've been redoing the old 58 and have rebuilt the motor and transmission along with the rear. I wanted to replace the parking brake cable but I need a new grommet for the firewall. I called CARS and they were not much help can anybody tell me where I can get one. The old grommet is an oval that is about 2-1/2 inches long and is bigger at one end then the other. Thanks
 
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