like on ncr and gas station i think even wincor have the CH751 key
https://atm-parts.en.alibaba.com/pro..._full_set.html
https://www.amazon.com/Southco-CH751.../dp/B001562UII
you can go on any key maker and say you have lost your camper key and you know is a CH751 if he can make it and problem resolved or buy on amazon
good luck
with respect
peace