Thsi kit is for the G-valve on RR363 Silver Shadows and derivatives.  The seals are made from the correct EPDM material to withstand RR363 brake fluid.  Also includes a new stainless insert and bleeder valve and cap.  The old insert is removed with a small easy-out.  The old square o-ring is updated with this new o-ring/backup ring arrangement for modern, improved sealing capability.
These are not for mineral oil cars.