I can't give you a definitive answer, but since it's a square head chances are it's from some sort of clamp. They usually put square headed bolts in clamps so they won't spin. A hex head bolt could spin in a clamp.
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GPRPCA Chief Driving Instructor
2008 Boxster S Limited Edition #005
2008 Cayman S Sport - Signal Green
1989 928 S4 5 spd - black
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