This Boot for the HiSun 1000 is from the Throttle Body to the Plastic intake pipe.
Approx. I.D. of 68mm and 76mm. Part # 17501-119-01000 is embossed on the rubber body.
This is the Main Oil Pump for the HS 800 and HS 1000 V-Twins and the Gasket is included.
Smaller Oil Pump mounted in Right Crankcase, 15500-010-0000
Please study the Parts File.