I ordered 94180-40800 lock nuts from toyotapartsdeal.com for this connection and they are too small. Clearly I ordered the wrong nuts. It is the manifold to downpipe connection that has the two round crush seals. I'd be very grateful to anyone who can supply me with the correct info to acquire the correct lock nuts for this area. My truck is a 1986 4x4 with the 22r.

 

Found this thread which answers my question: https://www.yotatech.com/forums/f116...-fixed-282448/

 

They should be M10x1.25 which ones did you order first ??