OEM Upgrade Speaker Kit by Kicker Subaru Wrx STi Crosstrek Impreza H631SFJ001 | eBay
KICKER 47KSC2704 2.75" Mid-Range Speakers, 4ohm with Brackets for Select GM/Chrysler/Subaru/Jeep and Toyota Included : Amazon.co.uk: Electronics & Photo
SubiSpeed - Upgrade you stock stereo system with Subaru... | Facebook
Upgraded door speakers with the kicker upgrade on my 2015 premium : r/SubaruForester