This is the lower rear bearing pin that fits between the rear of the lower wishbone arm and the back of the front subframe. There are two per car and as they are located below the bell housing so they tend to suffer from oil ingress. When replacing this pin, you may need the bearing pin washer part# UR17155.

1966-1980 Corniche, Shadow, T, Shadow II, T-2, Silver Wraith II 

1980-1982 Continental, Corniche, Eight, Spirit, Spur, Mulsanne (VIN 01001- 4701)

1982-1985 Mulsanne Turbo (VIN 04233-12474)