Tom R,
The proper fitting for that application is called a "threaded sleeve nut". It uses no sealant, has no ferrule, and it compresses around the OD of the tube as it threads into the sleeve nut adapter.
I know this is a moot point as R&R'ing it is a beast, but I thought I would just mention it.
I actually called my local NAPA store and described to them what I was after. I wanted to see if this item came as a "part" or was gathered up by someone and sold as a kit. If the latter were the case, maybe the incorrect parts were picked.
Good luck, and don't forget, there is always J-B Weld!
FOOTNOTE. NAPA manager returned my call. He searched his entire system and came up empty. :confused:
Stuart