Intake Manifold Boot For Big Bear 350 For 400 Moto 4 YFM350ER One side inner diameter: 29mm Distance between two assembly holes: 68mm (center to center) Other side inner diameter: 32mm Distance between two assembly holes: 59mm (center to center) Made for intake manifold connection between carburetor and engine Designed to fit specific model compatibility as listed May have slight variations due to manual measurement Refer to product images for details on appearance and structure Package includes: 1 x Intake Manifold Boot Packaged in neutral packaging Item is and unused