LSDA Interior and Exterior mailbox locks can be used to replace those used mailboxes. Because each kit contains a selection of five cams that match LSDA mailbox locks covering most mailbox locks used throughout North America. LSDA Interior and Exterior mailbox locks have cam kits to match those for: Florence Bommer Riopel Canadian Mailbox Auth Electric Security Manufacturing Essentially, when it comes to a mailbox lock with adaptability—LSDA mailbox locks cover the bases. The LSDA interior lock is used on many apartment building lobby or vestibule mailboxes. In addition, the exterior lock (when equipped with a spring-loaded shutter) is USPS approved for mailbox clusters applications found in apartment and condo complexes, business parks, and in many modern single-family homes.