One of the nuts on mine is mangled up, so I tried to fetch a replacement from the boneyard.  Wasted a lot of time, chewed up my knuckles, and came away empty-handed.

A regular flare nut wrench just couldn't cut it.  What's the right answer?  Does a crowfoot flare nut wrench work any better down there?

 

Vise Grips and a BFH to break it loose.

I have spares if you need one.  Just pay shipping from CO 80919

Thanks - I'll see how it goes and may take you up on that.  The problem was that with the engine in the (junkyard) car, there simply wasn't enough room to swing the flare nut wrench - or get a FH (B or otherwise) down there to help.  I'm pretty sure the one I have was messed up when I first resorted to the Vise-Grips years ago.  Nasty d@mn spot.

You can probably find just the right spot to set the vise grips enough to break it free.

Take some PB with you.

Having to work on them constantly, I cut the 15mm side off so it would give me the ability to move more.

O.