Is the 7540B-10 3 Way Mounting Plate included with the mail box? if not, is it offered by Lowe's separately?

Hello, the 7540B-10 3 Way Mounting Plate is not included with the mailbox and should be purchased separately if you plan to mount your mailbox to a 4x4 wooden post. The Lowe's item number is Item # 666872. Thanks for reaching out!