Fit Ex Works Grey Flash push rod assemblies ! ? You may ask. The seals can be renewed with out removing the heads and when stripping down the hassel of with-drawing the pushrod tubes out of the heads no longer applies ( usually get marked up dew to the pliers or mole grips when trying to get them down) as the adaptors that screw into the head are funnel shaped and fit into a mating funnel at the push rod tube and is all simply sealed by an "O" ring on the adaptor, there is of cause a stag when doing the "rear EX" & " front IN" as the tank has to be removed to extract the push rods.
The sequence is to remove the pushrod, unscrew tube nut,,, push tube down through the seal,,, unscrew adaptor out of head ,,,remove tube & tube nut,,, extract old seal,,, fit new with what ever extra goop you wish and reassemble..Have made several sets for various folk who like the idea but it is time consuming.