Check the listing for details. Gibraltar Mailboxes Universal Mailbox Mounting Bracket Molded Plastic Black,. Color: Black, Condition: New. Listed at 12.95 USD. Gibraltar Mailboxes Universal Mailbox Mounting Bracket Molded Plastic Black, The Gibraltar Plastic Mounting Board makes installing a mailbox easier than ever. This mailbox mounting bracket is compatible with any Gibraltar 4x4 wood or plastic post. Made from durable polypropylene plastic that will never rust, the mounting board has an ultraviolet inhibitor to extend its service life. Mounting hardware and easy to follow instructions are included for your convenience. Features Bracket can be adapted to install any Gibraltar Post-Mount Mailbox onto any existing 4x4 PostDurable polypropylene material is sturdy and rust-proofAll mounting hardware includedEasy-To-Follow instructions included Details {{itemdetails}} {{marketing_message_heading_1}} {{marketing_message_body_1}} {{marketing_message_heading_2}} {{marketing_message_body_2}} {{marketing_message_heading_3}} {{marketing_message_body_3}}