A couple thoughts regarding new plates:
*Make sure your vendor includes deburring the holes well, edges of the plates need to be smoothly rounded (break sharp edges)
*This needs to be done properly so as not to embed metal debris into the metal... debris left over from working on plain steel
will embed in the SS and rust starts quickly.
*If they are Electro Polished after fabrication this will help to eliminate this by eating away the steel
embedded in the surface.
polishing can make them not only look good,, but highly polished SS is much less prone to Inter Granular Corrosion.
*Plates made from sheared plate rather than flat bar may be more prone to breaking/cracking than old ones made from bar. The whole edge of sheared plate has been "broken" creating a multitude of stress risers. material must be removed from these.
So bottom line, if going new get them done properly.. otherwise you could be getting worse ones than your old ones!