Grommet or bushing for stereo install (wiring)

I've done some searching but have not been able to find what I am looking for. Probably just don't know the correct terminology which is screwing up my searching. I figure one of the stereo gurus on WW would know this off the top of their heads.

I'm working on a subwoofer box for my truck that has the amps integrated in between the 2 subs, and I want to cleanly run the wiring (RCAs, power, speaker, etc.) through the front of the panel with a series of circular holes. I'm thinking that a little plastic bushing with a flange on the outside surface would do the trick and provide a nice clean interface. When I use the term "bushing" while searching, all I find is car suspension stuff and fancy bushings for actual loads. This is more of just a pass-through cheap-o type of bushing I'm looking for.

Any tips or places to buy?

Thanks,
Danny

Grommet.

Radio Shack. I bought a bag of all different sizes there.........

It is called a closed snap in bushing here is a link. You can find these just about anywhere they sell electrical supplies HD, Lowes, Radio Shack, and Ect... Just one place I found that has large selection. Ordered some stuff from them when I built my wire harness for tower.
http://cableorganizer.com/richco/closed-snap-in-bushing.htm

Thanks for the replies.

Brandon, that's exactly what I'm looking for. I think that will look cleaner than a grommet, plus those standard grommets are really only made for thin stuff like sheet metal, not 3/4" MDF.

Danny