The E5CC-QX2AUM-000: Compared to the E5CC-CX3A5M-004 (which adds an analog output and RS-485 communications), this unit has the same basic PID function but lacks network connectivity. The CX3 uses screw terminals while the QX2 uses an octal socket – if the panel was wired for screw terminals, this isn't a drop-in. Similarly, the E5CC-RX3A5M-003 has four relays and heater fault detection, again with screw terminals. For a basic two-relay controller with SSR drive and no network, this is the part.
Panel mount with IP66 face – cleans up with a hose-down. Operating from -10°C to 55°C covers most indoor panels. The 11-pin octal base is common; just make sure your socket is wired for the relay and SSR outputs.