<https://qualarc.com/shop/wall-mailboxes/liberty-letter-plate/#product>
<http://schema.org/description>
"Liberty plates may be purchased separately for installation into front doors, garage doors or masonry walls. The letter plate is made of solid aluminum with a tough top quality enamel finish. Letter plate dimensions: H 5\" x W 12.5\" x D 1\""
<https://qualarc.com/shop/wall-mailboxes/liberty-letter-plate/>