In this schematic the "Cotter Valve" is used most often.
A sample from the products for the Cam Shaft - Valve include: Spring Set,valve, Screw,tappet Adjusting, Bolt(7x11), Spring.
The most reasonably priced component used on the Gsx750s 1984 (e) United Kingdom (e02) Cam Shaft - Valve is the Washer, Lower.