Sealing ring (approx 45mm OD) that fits between the steering idler and steering arm on 750, 101, 102 (2000), 106 (2600) and 105 Series cars. May also be fitted between the steering box and steering arm on some cars. Also used as a lower wishbone trunnion seal on later 750 Series and 101 Series cars with the larger wishbone bushes - 8 used per car.
For earlier cars requiring a smaller sealing ring, see part numbers 750-520 and 750-521.