Jason, that is the right bracket. The 85-87 mountings were identical. Those brackets came from an 85 for the aluminum and 86 for the metal one. I have the compressor that came from it if you want to borrow it for comparison. It has both switches in it. I think what happened is that they gave you a compressor that was clocked wrong or was for a 4 cylinder. It happens a lot with the alternators, so I suppose that some of the compressors fit different applications, depending upon how the housings are clocked. The Harrison compressor I have is clocked correct, so you can cross reference numbers to get the correct one. We can also run Ray's 86 and my 87 up on ramps to compare and be sure.
Believe me, you want that high pressure switch in place. If the evaporator core gets plugged or the cycle switch fails, it can over-pressure. That is the weak spot. Better to have that pop out than blow unavailable parts elsewhere. I've had one blow on my 87 when the orifice tube plugged up.
Edit:
Here's the compressor that goes on there. It's turned the same as your first picture. Note the position of the front mounting ears at 3, 6, and 9 o'clock. By mounting the metal bracket you got from me, it will line up with the 9 o'clock ear on the front.