Subaru Fender Liner & Lower Moulding Screw-Type Trim Retainer | Phillips | 21594

A screw-type retainer has a Phillips-drive center screw that, when turned clockwise, draws the retainer body inward and tightens the retention tabs against the back of the panel. This creates a more rigid, vibration-resistant connection than a simple push-type snap. Screw-type retainers are used in locations subject to higher vibration — such as the fender liner in the wheel well — where a push-type clip might gradually work loose.

The 21594 is used on Subaru fender liners (inner fender splash shields), air ducts and HVAC channel covers near the wheel well, and lower body moulding panels along the rocker and lower door areas. These locations are exposed to constant road spray, vibration, and stone impact, which is why Subaru specifies a screw-type retainer rather than a push-type in these positions.

Insert the retainer body into the 7mm mounting hole with the center Phillips screw in the open (backed-out) position. Once the body is seated in the hole, use a Phillips screwdriver or bit driver to tighten the center screw clockwise until the retainer locks firmly in place and the head sits flush with the panel surface. To remove, unscrew the center screw counterclockwise, then pull the body free of the hole.

The 21594 is available in packs of 15, 30, 60, and 90. A full fender liner replacement on a single Subaru typically requires 8–15 retainers, making a pack of 15 the minimum for a single repair. A pack of 30 covers both front fender liners with spares. Shops regularly servicing Subaru vehicles should stock a pack of 60 or 90.

A standard Phillips screwdriver or a #2 Phillips bit in a drill or impact driver is all that's needed. Use a low torque setting on power drivers to avoid over-tightening, which can crack the retainer head or the surrounding panel material. Hand-tightening is often sufficient for fender liner applications.