Mustang pulleys are the same. There are just two. My car's alternator didn't put out much charge with the stock alternator pulley, but mine just had the stock 75 amp alternator at that time (stock for the '90), yours might perform differently.
Looks identical to my ASP, but ASP's are powder coated black. Looks like maybe that one is flaking or something. The water pump looks stock, because its stamped steel, not machined steel. And that bottom thing...who knows lol.
1988 Notch Mustang: - 438W, direct port n2o, t56 2003 SVT Focus: - SCT X3 tuner