I purchased DPI stainless LCAs through Rob Grady a few years ago now. My original arms are the LCAs on the right and middle. Having had a ball joint fail on me and knowing how flimsy the originals are - and I know, some will argue that the original arms lasted 30+ years and only need inspection and majority of the fleet is still running them etc etc - it is comforting knowing I have upgraded arms despite the price. I felt the condition of the original arms, pictured, was far too gone to clean up and reinstall especially while traveling highways to work. Whether it is DPI or DMCNW, I'd suggest replacement over originals either way. Pictured below this, is a picture of my current SS LCAs, although the picture is a little old.
http://dmctalk.org/attachment.php?at...5&d=1485805284
http://dmctalk.org/attachment.php?at...6&d=1485805666