Whether replacing worn out OEM manifolds or adapting new carburetors to your project, using genuine Mikuni manifolds ensures a tight leak free fit and years of durability.  They're constructed of a rubber polymer that remains pliable in cold weather and after many years of use.  UV resistance means they won't crack or deteriorate in sunny climates.  Many different styles and sizes are available.  See the selection chart for dimensions and part numbers for ordering.  These are intended mainly for Mikuni carburetors and will work with some OEM applications.  Always check dimensions before ordering.