RECOIL SR65-4K Foam Speaker Rings for 6.5 Inch Speakers 4Pcs High Rebound Sponge Bass Blocker Car Kit

Eh, I can't really say for sure, but get at least some decent quality materials. Get some of these silicone baffles > https://a.co/d/018iCuL1 Some of these foam rings > https://a.co/d/0d0SeRm9 Then some decent matting. There's so many brands of it, I can't really say specifically which lol.