Universal Black 1/2" Plastic Depth Ring Adapter Spacer 6.5" for Car Sp – JSP Manufacturing
6.5 Inch Aluminum Speaker Ring Spacers Mounting Adapter Rings (Pair) INFINITY | eBay
Amazon.com: 1 Pair 6.5" RING-6.5BZ MDF Speaker Ring Recess With Bezel MOUNTING SPACER : Electronics
10 Pair 6.5" MDF Speaker Ring RING-6.5R Speaker Mounting Spacer Rings 20 Pack - Best Connections
Enrock Harley Davidson Speaker Mounting Ring Adapter for 6.5 Inch to 6.75 Inch (6-1/2" to 6-3/4") Speaker Fits 1998-2013 Harley Davidson Touring Models - Walmart.com
2pcs High Quality Universal Aluminum Alloy 6.5 Inch Speaker Mount Speakers Pad Adapter Plates Bracket Ring Mat Car Refit 6.5'' - Speaker Mounts - AliExpress