I've replaced the elbows on the vacuum line that powers the climate control knob once a year for the last 3 or 4 years, I'm sick of having to do it. I've been buying the package of elbows at Autozone that has 2 of every size elbow I don't need and only 1 of the size I do need, I think the last time I bought them the package said Dorman... both of them. Is this something I can get from a chevy dealer? I recall needing an elbow for my Blazer and the Chevy dealer told me they couldn't get it and sent me to Autozone . If the dealer isn't a source, is there a source for a higher quality and readily available, other than the Dorman elbow I've been replacing every summer?