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RetroFit Black Aluminum Mailbox Latch and Handle Kit - Easy Installation - Rust Resistant - Fits Most Post-Mount Mailboxes in the Mailbox Accessories department at Lowes.com
Pairs Zinc Alloy Locking Hasps 80mm Door Hasp Latch with Padlock and Key Latch Hasp for Furniture Mailbox Cabinet Drawer Cupboard
RetroFit Mailbox Latch and Handle Kit- Black Aluminum - Walmart.com
Thumb Latch - for Column Mailboxes - Locking | Mailboxes.com