Raydar's trans doesn't have that bracket and neither does mine. Both are 88's so it may be something that was eliminated in later years. I know I've seen it on others. I can't post a link from this device but search technical for Manual transmission identification with pics. There is a bolt in the bottom hole, but I can't tell it's purpose. I summize that it really isn't needed, having been eliminated in later years.
Look on page 2 of that thread, near the bottom. Gonzo posted some pics that show an angle bracket bolted underneath with what looks like a pivot pin in the lower part of the angle bracket.
Edit: I just enlarged your pic and it appears the angle bracket is there, but the bottom ear of the cast bracket where it bolts is broken off.
Edit #2: That angle bracket appears to support one end of the shift lever pivot pin.
[This message has been edited by fierofool (edited 04-29-2016).]