The Seeburg Lock seen here uses the G-219 key that is used on models M100A, M100B and M100BL. 

I'm a bit confused by its length however as it seems long for the back door yet short for the dome locks. Because of this I am including two cams or lock strikes. The strike mounted on it now reduces the effective length to what is correct for use as a back door lock on most models with wooden back doors.

One key is included.