Are there better brake calipers to fit a 2003 SRW 4X4 3500 that dont use plastic

[JPM]

Are there better rear brake calipers available to fit a 2003 SRW 4X4 3500 on the stock discs that don't use plastic pistons? I got a slight squeak that only shows up , slow speed ,when the brake is not applied, it goes away when the brakes are applied. Sometimes its barely notable other times it gets annoying , ( when everything is real hot , I think) The shop says I need new calipers, because one has its pistons not retracting enough.

 

[Ozymandias]

Stick with it, the what you call platic is far better then the old metallic pistons. Because no rusting.
Complete Calipers cost around 70$ at Rockauto so it's a no brainer.