The track is a problem to mount due to the angle of the recess for the bolts. The recess is a non standard angle (it is used in the aircraft industry) so you can not buy flat hear bolts that work locally or the standard thread with the 100 degree angle. . My only option was to re-counter sink the holes to a standard angle.
A note should be in the description to this problem. USCC did not carry the needed bolts. Later I did come across other sites that did sell this track with a standard angle recess for flat head bolts. I was installing 1/4 x 20 inserts on trailer wall plywood so I was using 1/4 x 20 flat head bolts.