This is the ball pin for the center steering lever / track rod center to steering or idler lever on the later MKVI (from B215PU) and R Type models.  It accepts seat RF8288 Note: 2 Required...

This is the steering lever found on LH drive manual transmission cars.  1945-1955 LHD models with Manual Transmission/Gearbox  

This is the heavy steering drag link spring. 1945-1955 Silver Wraith, Mk-6, R-type, Sliver Dawn