Never, ever use vice grips on tubing fittings.. All sorts of bad things happen as a result.. The proper tool is a flare nut wrench, sometimes referred to as line wrench.
https://www.bing.com/search?q=flare+...lvar=0&PC=LCTS
I speak from experience as I have over 30 years experience as an automotive technician.. I can't recommend the use of heat, as I never had to use heat to break a fitting loose, just muscle and patience..
Now about the "kit" you purchased.. The one I got from Summit appears to be the as the one you referenced in the link. Mine came with a new proportioning valve...