EXCLUSIVE Mail Boss Wall Mount Bracket for Letterbox H: 100mm, W: 100mm, D: 260mm Green SKU: 247810 MODEL: 54058 Error. try again later You've successfully joined the club $ 17 .60 each Available on orders $50 to $1500.More info × Mitre 10 MAvailable at Mitre 10 MEGA stores. Variants Fits Mail Boss post mountable letterboxes. Features and benefits Rust resistant galvanised construction. Durable powdercoated finish.