I'd clean those brackets as best you can and leave them and use that weathered pulley. Or clean and paint the original. Mine was still pretty shiny and I didn't bother with any paint. I feel like that pulley doesn't get as beat up as the others, thereby remaining shiny.
I would hit the bracket with a little 0000 steel wool in parts washer and spray it with boeshield t-9. Rub it around and call it good. I would blast the original pulley and paint it. Nice work