Mailbox Replacement with Secure Mounting

I need the old metal mailbox taken off its current metal post and a new standard plastic mailbox installed in its place. The post itself is staying, so the job is strictly remove-and-replace. Please make sure the new box sits level, is firmly attached, and doesn’t wobble or shift when the door opens or when light pressure is applied. No painting or touch-up work is required on the post. Once the mailbox is solidly in place and the area is tidied up, the task is complete.