Brey Krause R-9257 Passenger Seat Side Mount Adapter - BMW E46, X-Large WidthThe Brey Krause R 9257 Seat Mount is a unique direct to floor mount that fits the driver side of BMW E46 3 Series Sedans and Coupes (including the M3). The R 9257 works with wider width side mounting seats with a measurement at the side mounting point of 443 460mm. The lightweight bracket is designed to bolt directly to the floor of the car using the factory BMW seat mounting hardware, eliminating the heavy sliding mechanism, and providing the lowest