These are the Cylinder Head Bolts for the Exhaust end of the 450, 500 and 550 Cylinder Head, requires (2), sold each.M10 x 230 x 1.25The Intake Bolts are longer M10 x 261 # 90035-004-0000
These are the Cylinder Head Bolts for the Intake end of the 450, 500 and 550 Cylinder Head, requires (2), sold each.M10 x 261 x 1.25The Intake Bolts are Shorter M10 x 230. # 90034-004-0000
This is for the Head Gasket only. 800 and 1000 share the same Head and Base gaskets, the Stoke is longer on the 1000 and the 1000 Cylinders are Taller.