This is a pack of two optional XRAY Aluminum Adjustable Body Post Stops. These very handy, easily externally adjustable body posts are made from Swiss 7075-T6 aluminum. They allow body height adjustment by 3mm without needing to change the position on the body post. Fits T2, T3, T4 cars (front & rear) and NT1 cars (front only).
Works great for adjusting height on slightly uneven or warped bodies. I don't know how well they'll hold up long term as they use a standard pin to secure each mount. Will the pins vibrate out after extended driving, who knows? But they feel like they sit pretty tight once you get them installed.