The outgoing 55/65EF9500's DO require LG's OTW150. The bolt holes are at approximately 200mm top and less than 200mm width bottom. A beveled plastic adapter is included for the top two mount bolts--you remove two pan-head case screws to make these holes available for the mount bolts--and flat plastic offset adapters for the bottom

The OTW150 works for 16" on-center studs (+/- .25") or block/masonry mounting. There is NO lateral shift possible when stud mounting...Where the stud bay is centered, so will your OLED be, barring modification.

As I understand it, the new OLEDs now arriving utilize standard VESA spacing (likely 200mm x 200mm). Let's hope so!