I have a '93 5S-FE and below is an exerpt from Toyota's Shop Manual. Assuming they're the same (and I think they are) it is not either manifold bracket. For an exhaust bracket it's too long and the intake bracket has one end (lower) angled as well as a foam insulator. I have mine apart right now and cannot see your bracket. Actually I just went through both Volumes and could not find it. I went through Manual, Automatic transmission, wagon variants and all the body hardware I could see...I give, you got me. I think dad's messin' with ya.
Two things to consider:
1) It came off another vehicle.
2) The ends where the holes are do not look like they have had bolts holding them down because of the lack of scratched paint.