Car audio nerds, this one's for you!
If you're installing 6x9 speakers and running into clearance issues, these MDF spacer rings from Sound Mekanix are your new best friend.
They're 1/4 inch thick (that's .25 for you number people) with a 5.375 inch opening, and you get a pair - enough for two speakers.

Made right here in the USA, baby!
The material is MDF (medium-density fiberboard), which is actually better for speaker mounting than plastic or metal because it's dense and doesn't resonate.

You get cleaner sound, better bass response, and no more rattles.
Color is brown (it's wood, what'd you expect?), shape is oval to match those 6x9s.

They're universal fitment, so as long as you've got 6x9s, these should work in most vehicles.

Maybe you need to space your speakers out from the door panel, or maybe the window mechanism is in the way.

Whatever the issue, these spacers give you that little extra room to make everything fit right.

They're brand new, made in the USA with quality materials, and they'll make your audio install look pro.

Stop jamming speakers in there with washers and homemade spacers - do it right with these MDF rings!