6x9 to 6.5" speaker adapter and enclosure.

thingiverse

Adapter plate to put a 6.5" speaker into a standard 6x9 spot. There's also an enclosure for it which you may or may not want to use. If not, just print out the face plate and you'll be good to go. I made this for a Jeep Grand Cherokee, but it's a standard size so it should be fine for any 6x9 location. There's a 1 piece and then a slightly more advanced 2-piece if you want to avoid supports like I did. Last, I didn't put a hole for speaker the speaker wire because there are just too many ways to do it, so I leave that to you. Hope it works for you! EDIT: After printing, the tolerances were too tight. Adjust faceplate. Also, I made this thick because I didn't want it to absorb vibration from the mid-bass but it's a little overkill. On the upside, it's very rigid and strong. I'll make another when I get time.