I'm not sure if they'll sell just the inserts...it'd be worth a try. You should check out some of their work. They have some pics on their website. It looks really great.

'96 Mystique, tinted windows, 760w Sony Xplode amplifier, 2 12" Pioneer IMPP 450w subs, car wired with 4 ga. monster cable. Performance mods soon to come, header, intake, plugs, etc.