Hi DavidP, thanks for the reply.
The fitting in question is the #1. Behind the bolt the fitting is 3/4" thick. I made an attempt to fix the problem by epoxing the extension adapter(#2) to the stripped fitting. The epoxy seems to be holding okay but it is leaking on the other end because the extension is a 45 deg. flare gas fitting and the mating hose is 37 deg. I had the brass extension on hand, so I figured I give a try.
So, I suppose the different flare degree and/or possibly the hose fitting are damaged. I would much rather find a source for a new banjo fitting, but if I have no choice, I'll use a suggested practical solution that is better than mine.