Ah, OK. Now I see what you're talking about. No, personally, I've never seen that exact style in SS, either. But, a couple ideas to throw out there...
-- The mounting brackets are likely OK since they are starboard, right? It's just the actual rod holder that is deteriorating from the UV because they're plastic? POSSIBLY, you could just replace the actual rod holders with "side mount rod holders" (google that). You might need to cut off the mounting ears or figure something out, but I imagine it wouldn't be too hard - the SS side mounts might slide right into those existing holes and secure them with a screw or bolt/nut at the bottom.
-- Use side mounts, but mount them direct to the motor well, or to a sheet of starboard and then mount the starboard to the motor well (would be a little stronger this way and less stress on the motor well).
-- Another option is to change the style of the whole thing... check this out:
http://tacomarine.com/category/rod_stor ... nd-Storage There are other brands, just linking this one to get you going... and it's easier to show you pictures than try and describe it!