A sample from the products for the Valve include: Shaft, Rocker, Shaft, Rocker, Valve, Intake, Spring, Valve Outer.
The most reasonably priced component used on the Xg250 2005 4d61 Norway 1d4d6-352s1 Valve is the O-ring (328,329).
In this schematic the "Cotter, Valve" is used most often.