The other day I had a rear wheel off and noticed one of my shock airlines is about worn through, at the edge of the fender lining (about 6" from the shock). Probably a common problem. It measured to be about 1/8" O.D., which is a size tubing I can get. GM price for the replacement kit (both sides, rear, was $52).

Does anyone know if the fittings at the shock and pump can be re-used with replacement bulk airline? There is a big 90 elbow at the shock end - I haven't removed the compressor shield to see what'* at the other end yet.

I should think you can get that tubing and appropriate fittings in bulk at Pep Boys, Autozone or one of those type places for less $ than what a GM dealer would take from you.