The Collet,retainer is the cheapest item from this partsfiche.
Parts such as the Valve (uk Only) (kz750ne020535~): Seat-spring,valve, Shim,t=2.65, Shim,t=2.50, Shim,t=2.05 are included in the Z750p5 1987 United Kingdom / Mph Valve (uk Only) (kz750ne020535~) parts fiche.
The Kawasaki VALVE (UK ONLY) (KZ750NE020535~) has thirty-four products enlisted in the schematic.