yes that is the stock mount in the above pic.

allthread is a threaded rod that you can get at any home depot type store, get either 6-32 or 8-32 size, then cut it to length(they come in approx 3ft lengths) and put a slot in the end for a screwdriver and you can screw it in for a snug fit (with epoxy all over it) just make sure that when you drill the holes you stay clear of the LG mount screws, (look at above pic)