This die-cast aluminum plenum-style spacer will add 5.5mm between your carb and manifold to help solve clearance issues for larger alternators and/or other issues. Use with all EPC DFV and DGV progressive and synchronous carbs. Comes with 2 plenum cut gaskets for installation Carb Type: EPC DFV DGV Thickness: 5.5mm Quantity: Sold EachCarb Spacer for Progressive EPC DFV & DGV