I do have the standard flaring tool and will see if that works. I am flaring the cutoff original line while it is still on the truck so one of those one handed tools might be needed if I can't hold it steady enough. Thanks

 

After a lot of thought and trying things, it turns out the original line has a coating on it but is very difficult to remove that so I ended up taking one fitting and reaming it out a little bit. I was then able to get it on to the original line. Tight but will work. Now if I can flare the line while it is on the truck I will be in business..

 

That makes sense ... good luck with the flare.