after reading these post and if still confused ,then carry the plane to your club or hobby shop,on some planes the mounting system is built into the plane which makes it hard to change the mounts, on your plane think you can set the engine on the mount,mark and drill the mount then install srcews with lock nuts,make sure the engine points stright or a tad to the right,2 degrees,not to the left.
Have a goodun,John.