Just to reiterate the advise from before, you CANNOT use t-nuts on both sides of the panel, only on the back side. Assuming that you hammered down both t-nuts, when you insert the bolts, it will probably not engage the threads on the rear t-nut properly and cause either the front, the back or both t-nuts to lift. If you did not set the t-nuts before inserting the bolt, neither t-nut will draw down.

Again, ONLY ONE T-NUT PER HOLE!!!

Bob