My brace is identical to Jim's. I gotta say, I've been very happy with it. But my '87 has two very large washers with a busing between them. Like this from this link:
Strut Brace Installation
So the brace that I have and the one Jim shows probably won't work with my '87? So on that car I'll have to use the surrounding allen bolts.
SO......
I've seen some that use the rear two bolts, seen them using one rear bolt, now SLANTNOSE6 posted a pic using just the front bolt, I've seen using all three, and I've seen Weltmeister using all three PLUS the top of the strut. I don't even want to get into the triangular ones. That is for another day. Just about every combination known is out there for sale. They all do the same thing, but is one superiour over another? I'm leaning towards the ER one. That one uses one bolt.