2Pcs 6.5inch Car Front Door Speaker Spacer Ring Adapter Plates for Ford Focus Speaker Install Mount Adapter Plate Brackets Stand|speaker adapter plates|car speaker adapterplate bracket - AliExpress
4 Pieces 6.5inch Rear Horn Speaker Spacer Rings Suitable for Toyota 05 11|Styling Mouldings| - AliExpress
Metra 82-4300 Speaker Adaptors for Universal 1" Plastic Spacer Rings