Exhaust bolts, Old vs. New Options

[RustyWa]

Just pulled off my heat exchangers and exhaust manifold "thingy-ma-jig" off the heads from my stock '75. There seems to be quite a bit of difference between the old nuts that attach the manifold to the heads and the new nuts I got from Pelican.

Are the existing ones I took off stock? They are much thicker and look much more "stout".

[Dave_Darling]

The ones on the left are the stock ones. They are really absurdly expensive--something like $10 each. The ones on the right are from an Audi (evidently a 924 as well) and work just fine. They are also much less $$, under a buck each I think.

Differences:
The new ones are shorter.
The new ones use a 12mm socket instead of 13mm; I have found the smaller socket is easier to get to the exhaust nuts when installed.
The new ones are "squeezed" to lock; the old ones have a slice taken out of them to lock.

They both have the "shoulder" that seats on the exhaust flange. They both are copper coated. They both work just fine.

--DD