i went through like 4 or 5 plastic elbows in less then 3 months later had to replace tensioner pully and entire assembly($50) it came with elbows from gm havnt had to replace them for 3 months now and when it gets warm im putting my alluminum ones in but hell i beat the piss out of my car and baby her at the same time so you might have better luck with the plastic ones Search: 47065 | Heater Hose Fitting | AutoZone.com
aluminum heater hose connector | eBay