I've had a pierce strut brace for awhile now.
It seems like the thread for the 10mm nut isn't long enough to have the 1/8(?) inch base plate of the brace and the thick mishimoto mount. Its also tricky to get it all stacked up right in that tight little space. You gotta get the brace on first, then flip over the thin mount for the ac-line(?), and lastly slide in the tank partially and lift everything up to try to get the mounting pegs lined up. Once you get it all on, the 10mm nut doesn't have enough thread.