Exhaust Manifold Yoke Washer Stepped for Header 240Z 260Z 280Z 280ZXStepped washer for use with aftermarket headers and intake manifolds on Datsun "L" series engines. Stepped washers are sold in a set of 6. These washers are designed for when using an aftermarket header or intake manifold and there is a difference in the flange thickness. If a stock washer is used with flanges of different thickness's there will not be an equal clamping force on each manifold. Choose between 3 different washer offsets. 23mm O. D., 8.