Mikuni Rubber mounting Sleeve Manifold 40mm Id both ends Heavy duty rubber sleeve with 40mm ID, 54mm OD & 34mm centre hole 4mm wide centre centre block for minium standoff Suits Mikuni 30, 32 and 34mm carburetors Will adapt to fit motorcycle carb spigots ranging from 38 to 42mm ID Stainless steel clamps with rolled outer edges included