Amazon.com: RED WOLF 6.5 Inch Rear Door Speaker Adapter Spacer Rings Replacement for Subaru Forester 1998-2020, Impreza 2007-2019, Legacy 2003-2014, WRX 2014-2020 2PC : Automotive
2Pcs 6.5" Inch Aftermarket Speaker Adapter Plates Mount Kit Brackets for Subaru 769894710159 | eBay
Leewa 2pcs 6x9 To 6.5" Car Speaker Spacer Solid For Subaru Forester Front Door Audio Pad Mat Adapter Modified Rings Kit #ca5523 - Cables, Adapters & Sockets - AliExpress