TRNW-2: 2018 Lincoln Aviator Catalytic Converter Nut Size

[tucker tuckertrans.com]

Group
 Does anytime know the exact size of the nuts that hold the catalyst converter nuts to the manifold?  It is the 'E' type nut 6 point but we tried an E22 and it fits a little loose.  We used a 17mm 12 point to get them out but man oh man they were tight and we want to have the right tool next time.  I don't like using a 12 point socket.
Maybe it is an E 22.  I don't know.  I do know rounding it off would be a bummer.
Dan Tucker

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