Use this plate to block off the pesky EGR hole in the exhaust manifolds of emissions control equipped Spiders from 1974-1977.
Will require a gasket between the block of plate and the manifold, you can resuse the original gasket if it is intact, make a new one, or purchase one here.
Note:
1974-1976 Spiders have 6mm mounting studs, a flat washer should be placed between the mounting nuts and the block off plate to seal around the stud.