Hi Dave, welcome to the forum. The information I can share is regarding the 90' 2.4, though should be the same.
That is a specific bolt for the alternator: it had a square head and the head is thin. The bolt is tightened on the firewall-side of the alternator. Oddly, this very bolt topic came up in chat the other night.
I'm not sure about the replacement of them, but I'm pretty confident you need that specific bolt, or one with the head sanded down. You'll note the square fitting for it in the alternator: this holds the bolt while the nut is tightened on the other side (toward the firewall). The bolt goes through the alternator and a mounting hole on the block (it does not bolt into the engine block). The bolt is roughly 3-1/2" long.
The photo below is the best I can offer to show the square bolt. Click on the image to enlarge.
scan0012.jpg
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