Those style switches are individually replaceable. You do not need a panel.
I am guessing function is Center off, Momentary 3-position switches, spring loaded= MOM= Momentary-Off-Momentary. You can buy at local auto parts, or electronics/ RV store, or Online? They operate thru small wires to the coil of LATCHING SOLENOIDS that only require momentary power to latch ON, and momentary REVERSE polarity to Unlatch/OFF.
Also possible your switches are good and solenoids bad? or BATTERY/ batteries TOO LOW to make the solenoids CLUNK?
2000 Conquest LE 6266, Class-C on 99-E450SD, 6.8, 2v, V-10