Manifold slant 6 cone castle nuts

I have some NOS nut and washer kits with those included. It's the later style washers( '73 and newer) if you care. They fit the same as the earlier ones, just have a slight appearance difference, and the triangle washers are a bit thicker than the earlier ones, and the brash washers for the ends have a bit more taper where it fits the nuts you seek. By the way, the photo that Northern Grit posted has the nut on backwards. The tapered end, where the slots are, go against the brass washer, not the flat other end. I know, it's not like just about every other application on a castleated nut (like a tie rod for instance), but, it's to keep the brass washer centered and allow the end exhaust manifold runners to expand and move slightly so they don't break off the end studs or crack the manifold.