Thank you for your interest in our products. If it is not a stock item you can go to the Pro Service Desk they can special order for you.
Thank you for your interest in our products. No, the Gentry all in one can not be mounted over a 2'' pipe. It is design to over a treated 4 x 4 wooden post 48'' in height.
No, it comes with everything you need
Check for the post office for height of box
Mail is always dry no moisture
In the Product Overview section of this mailbox on Home Depot's website, to the right is a section with a link for Installation Guide. Click on the link and go to step 6. You will need (4) #6 X 15/8 screws. I'm sure you can purchase these at the same time as the mailbox.
The instructions call for a 4"x4" post to be 22"-30" above ground. You can slide the mailbox and post combo over your post first to see how much of your 4"x4" post you would have to cut off or dig it deeper in the ground.
Yes, it can. There’s a separate door.