Some items from this specific schematic: Guide,valve, Bolt,flange,8x80, Clamper G,tube, Seal,oil 27x43x9.
The most reasonably priced component used on the Gl1500 Goldwing 1989 (k) Finland / Kph Cylinder Head is the Screw,cross 5x8.
Of all the components used in this assembly the Head Assy,cyln. is the most expensive.