Like others have said the original switch is made from unobtainium (not available :) ) and the switch shown WILL work and IS rated at 50 AMPs. I'd also STRONGLY suggest (minimally) adding a 50 AMP circuit breaker back in to the line as that is what the factory did with that sidecar module mounted to the original switch. If you JUST use the switch, no circuit breakers or relays (actually a better suggestion) you are asking for a dash fire. These wires and connectors are 50 years old now and were never intended to last this long.
