The MantelMount PE40 Extended Wall Plates are a direct replacement for installations in which the wall studs are more than 16 inches apart. Our MM340 Standard Mount and MM540 Enhanced Mounts have wall plates designed for standard 16 inch on-center studs. However, sometimes the studs in the wall are further apart. The PE40 Extended Wall Plates attach to the lifting arm the same way the standard wall plate does, but they can reach studs that are up to 32 inches apart. The wall covers included with the MM540 will still attach to these extended wall plates. (For Models MM340 and MM540)