We where donated a Quadrum GTE Payphone Upper Housing - Protel
But we’re needing to acquire the lower housing and wall mounting plate. Would anyone know where to find these besides ebay?
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You’re basically needing to buy a stripped phone. 
Edit: Dad (retired lineman from Verizon/GTE) suggested contacting the folks at sandman.com
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That or commission more talented individuals at the space to help create a mounting piece and backing for it on our tools.