A retention clip for attaching an outer belt weatherstrip to a flange includes a backing plate and an anti-rotation feature attached thereto. The anti-rotation feature biases against the flange to draw the backing plate against the flange to remove lash from between the flange and the backing plate in a lateral direction relative to a first primary axis of the retention clip. An axial biasing member biases against the top edge of the flange to remove lash from between a lower edge of the flange and a latch of the retention clip in an axial direction along the first primary axis. A spacing element engages an interior surface of the outer belt weatherstrip in abutting engagement to resist movement of the outer belt weatherstrip relative to the retention clip along the first primary axis. A release mechanism allows the retention clip to disengage from the flange.