Fontana 4 cylinder Plenum nitrile 18 hole backplate rubber gasket Fits Fontana Plenum and Zolder 65X airbox to 1.5 Bar max boost.
For higher boosted applications we recommend;
R01SE6246 4 Cyl Turbo Cnc Billet stiff 4mm Alloy Back plate (>1.5bar),
R01SE6248 4 Cyl Turbo Cnc Billett Back plate O-ring seal,