Slant 6 Manifold Nuts

Jack Curran said
Hi there,

I'm looking for the special locking nuts that go on the slant 6 manifold. They fit into a slightly tapered brass bushing and look almost like a castle nut (highlighted red) See photo below:
View attachment 1715660209
From the photo it looks like there are two versions of the brass bushing that the nut threads onto, the ones I have have the small lead in I'm assuming this is the right nut for them. The other style of special locking nut to the left in the photo would probably work as well.
Thank you for your time.

View attachment 1715660208

It's actually the other way around. The one on the left is the early one and the one on the right is the later version. As I mentioned, you can't really see any difference once they're installed. The brass washers are slightly different too, but so slight as to be meaningless. If you're looking for 100 point show car parts, get the originals. If you don't care about that and want arguably better parts, use the later ones.