I decided to replace the valve springs on the used 5.7 engine that's going in the Durango and these are the ones that I went with from ebay.
https://www.ebay.com/itm/Valve-Spri...DX%3AIT&_trksid=p2060353.m2749.l2649I figured it was far easier to replace them while the engine was out rather than take a chance that one would break later.
Our local Mopar engine builder said that the replacement have the anti-oscillation damper on the outside of them.
He said that's why the earlier ones tend to break.
He said he used the ones like this and hasn't had a problem with them.