Google "5.0l Mustang power steering pump bracket" and look at the images, it'll give you some idea what it looks like.
OK, I see it now. I always assumed I was looking at the actual pump in those pictures, and thought I was cool getting a smaller pump! Ebay, here I come!!!
They are both serpentine, the first one is the early 86-93 style, the second appears to be the 94-95 bracket.
You need to match the components. If you currently use the early arrangement, you'll need the early PS bracket. The later components use a shorter water pump, crank pulley, etc for that move the belt closer to the engine block but use different accessories. ie: FS-10 or FX-15 compressor, 3G alternator and the smaller PS pump. In short, based on your pic, I think you need the first bracket
OK, got the round bracket today, pump fits in it, but it doesn't quite fit the other brackets. I can make it, and will have to, I guess. It appears that I will have to make two 1/2" long spacers to go between the existing bracket and the face of the round one, and grind off just a touch of the aluminum to make it fit. It appears that if I slide it back flush against the engine block that the pulleys will line up.