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https://www.dormanproducts.com/p-540-03131.aspx#

I'm trying to replace the exhaust manifold on my 2010 Chevrolet Equinox (2.4L 4-cylinder), and there are studs which connect the catalytic converter to the exhaust manifold. I cannot, for the life of me, find the name of the head on these things. I also cannot use the double-nut method since there is little to no working space available to me.

If anyone could identify this, I would greatly appreciate it. Other Ecotec engines of this period had inverted Torx sockets, but this one seems to be some rounded-rectangular head.

I've currently got penetrating lubricant sitting on the stud and plan on hitting it with the cold fluid from an upside-down compressed air canister to shrink the metal ever so slightly to help with extraction. Any other tips appreciated :)

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It's called a double D or shock absorber socket

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