The Best Just Got Better!The ID1750 is the successor to the ID1700, featuring numerous improvements. Compared to the 1700, the 1750 offers: Higher Dynamic Flow Rate With no Increase in Minimum Fuel Mass. Better Cylinder to Cylinder Balance at Low Pulsewidths. Improved Pressure Sensitivity. All while retaining the same “Compatible with everything but dirt” corrosion resistance that made the ID1700 famous. Please note the length option for injectors. If you are unsure which length is required, please contact [email protected] or refer to the application guide found here. The length is noted as the second number in the part number. 1750.34.14.15.8 is a 1700 injector, 34mm o-ring to o-ring, 14mm upper o-ring, 14.5mm lower oring, and quantity of eight in the set.