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Those parts are NLA as outlined then.....and yes, you will need to upgrade to a newer style unit which is called a Single Zone thermostat and it is a digital model. They don't make analog units any longer. The kit you need is part number(###) ###-####000 and it sells for about $90 or so at most RV outlets. It uses just 3 wires for the lead from the control box to the thermostat location. That may be a challenge depending on where you want to mount it. Hope that proves helpful here. Please get back to me if you need more as all follow ups are included in our fee.