I was going thru my routing maintenance and noticed a small leak right where 1 of the heater core lines attaches to the heater core. It seems like this is a pretty common issue so I wonder if the metal version of this fitting would be a better choice. Has anyone had issues with these fittings ? I think there are 2 of them, both identical but go by different part numbers for some odd reason : 15032062 or 15151875 or dorman 800409

It looks like GruvenParts.com is making these now if you look on their GM page 4 up from the bottom : GM Trucks auto parts