I just bought a house with a working FBII 4612 alarm. The previous owners took the downstairs keypad when the moved and I’d like to replace it with the best/latest keypad available. (The alarm was installed in 1995, so the keypads listed in the manual look like theyre from the 90’s.) Any suggestions? I learned that there may be some compatability issues as j already attempted to use the Honeywell 6160 5i no avail. Thank you for any guidence!