The Bolt,flange, 6x25 is the cheapest item from this partsfiche.
The Gsv190a\n1l\14z2d403 Cylinder Barrel consists of nine pieces with the Barrel Assy,cyln being the most expensive.
Some items from this specific schematic: Brg,ball 25x52x15, Barrel Assy,cyln, Oil Seal 25.4x74x, Cover,head.