Amazon.com: ASC 6+-Inch 6" 6.5" 6.75" or 6x9 Front Car Speaker Install Adapter and Tweeter Mount Bracket Plates w/Speaker Wire Connectors for Select GM GMC Vehicles- See Below for Compatible Vehicles :
American Hard Bag IP-14-5X7-6X9-L Speaker Adapter Set 5×7 to 6×9 + Hertz SX690NEO Speakers For Harley Davidson® CVO Lids 2014-2022 WITH Electric Locks – Volunteer Audio
5x7 to 6x9 Harley Boom Speaker Adapters | Scosche
Amazon.com: Metra 82-3004 2014 6X9" Speaker Adapter for Select GM Trucks,Black : Electronics
Toyota Tundra 6x9 Budget Friendly Speaker Adapter Installation Kit
American Hardbag 5x7 to 6x9 Speaker Adapters for '98 through '13 Harle| Maverick's Custom Motorsports