Make mailbox installation a total breeze with the Architectural Mailboxes Plastic Mailbox Mounting Board- the mailbox accessory that does the hard work for you. Compatible with all Architectural Mailboxes posts labeled with Match Code A, B, C, or D, this handy mailbox add-on ensures a perfect fit every time. Crafted from durable, rust-proof polypropylene and treated with UV protection, it’s built to handle years of sun, rain, and daily deliveries. Whether you’re using a 4x4 wood or plastic post, the included mounting hardware and easy-to-follow instructions make setup quick and simple. Durable, dependable, and delightfully easy, it’s the mailbox part that proves installation doesn’t have to be hard work.