Here are the backs of the grips. Note that the bottom pair has the threaded holes at the bottom of the grips. The upper pair however has the threaded hole at the bottom on one grip and at the top on the other grip. Also note that the hole or mold mark is farther from the bottom edge of the grip on the right grip panels than the left grip panels.
http://boards.rennlist.com/upload/BlackWidowGrips2.jpg