JSP 2-Pack Car Boat Marine Speaker Adapter Plate 6x9 5x7 6x8 to 5.25" – JSP Manufacturing
2Pcs 6.5" 20mm Depth Car Speaker Spacer Ring Adapter Bracket Extender for - Walmart.com
Speaker Adapter American Int. 4X10 - 6X9 Adapter Kit (Pair), Pair American International Sa41069gm 4x10 - 6x9 Speaker Adapters By American International - Walmart.com
Custom Made Speaker Adapters - Compatible with Select Toyota Vehicles – Sounds Good Stereo Online