Amazon.com: American Terminal AT65ADP 2 Pack 6 1/2 inch Speaker Spacer 1/2" inch Depth Extender Rings 6.5" Pair : Automotive
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
Car Speaker Spacers and Rings – Installation Solution
4" Inch / 100mm / 10cm Universal Car Speaker Spacer Adaptor Ring Pods SA-009 | eBay
2pcs Black 6.5" Car Audio Speaker Mounting Spacer Adaptor Rings for Mitsubishi | Walmart Canada
TWO 6.5" CAR STEREO SPEAKER SPACER MOUNTS 1" DEPTH RING ADAPTER STACKABLE - Newegg.com