I think my Pro Melt 2 is #68, I have tried both valve stems but a couple pots full after cleaning the darn thing drips. Oxides seem to build in the orifice and it stops sealing. I've looked at the original Pro Melt valve and the stem is completely different from the PM2. The Original tip is straight with a flat tip whose edge seals against the valve cone. The PM2 valves use a cone within a cone and I think there is too much surface area to seal well. I will try making a stem for the PM2 at some point but with the PM2 cool down it can sit in storage for a while.
The thermostat in my original Pro Melt was toast when I bought it and the inkbird PID I got was counterfeit so I bought a new Auber PID. I also had to clean the pot of questionable alloy so I tore it down, removed the thermostat and replaced the strain relief on the power cord. I was able to run a pot full before trees came down and I had to work, not one drip but we'll see how it goes.
You can see the spout better on the original Pro Melt than the PM2