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
4"/5"/6"/6.5" inch Audio Speaker Spacer Adaptor Ring Bracket Mounting Adapter | eBay
Mounting Ring for 6.5 Speaker | CyclePartsNation
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