I used these to mount two garage door knobs into the wall. Simply remove the pieces and drill the correct size holes for the button you ordered. You need "closer" buttons. They are perfect for standard bell buttons or large buttons. I bought them: https://www.amazon.com/gp/product/B079HTQ7XD/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1 19mm or 3/4 bit required. This is the maximum hole size without touching the supporting structure of the metal frame.
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