[giffo]

Thanks for the advice, gmtech1. I'll ask my questions of the parts store.

Given what has happened to a vehicle that I expected to last me a long time, I'm not in a friendly frame of mind to talk to the GMC dealership - yet.

I don't anticipate re-using the old fittings because I plan to buy a length of pre-flared tube with fittings. In order to re-use the old ones, I'd have to cut and re-flare the replacement section. Although I have a flaring tool, I'm not confident of its ability to create the type of flare necessary.