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.
This Sensor has 14mm Threads and the Sensor Tip is 11.5mm O.D. (See Pictures)
If you have a 17mm Thread with a thin Sensor Tip of 5.5mm let us know to send that instead.