Nostalgic AC - Automotive AC Fittings1- (888) 977-8889. AC Fittings. There are many different types of beadlock and barbed automotive a/c fittings including o-ring, flare, and quick disconnect or spring lock. We stock them all! If there is any fitting you would like to get that is not on our website, please call us and we will see if we can acquire it for you.