Many people run the Dayco pulleys that you can get locally at your auto parts store. Some run the Dayco 3" pulley for a 6-ribbed belt. It is part # 89007 and costs about $17 at CarQuest. The stock washer/dust cover will fit this pulley. It is a little narrow, but works.
The actual 3" Dayco pulley for an 8-ribbed belt is part # 89016 and it is about $19. This one is wider than the belt, like the stock plastic ones, but will not accept the stock washer without mods to the washer or using a smaller washer.
I believe a lot of our vendors sell the Cobra pulleys and they will not a
ccept the stock washer either.