GOOACC 100PCS 7mm 8mm 10mm Compatible with Subaru Push Type Retainer Fasteners Rivets Clips OEM Upgrade for 90914-0007, 90913-0067 & 90914-0051 + Bonus Fastener Remover

And these are the retainer clips, the little plug that most likely broke that goes into the side. It is great to have extras because they break easy. They will fit everywhere in your car, they reuse the same sizes all over. https://www.amazon.com/GOOACC-Compatible-90914-0007-90913-0067-90914-0051/dp/B07WHRL17D/ref=mp_s_a_1_3