Yes that number should. I looked at my two 120's and both si and super have a plastic tank only regular 120 has a metal one. The si is definitely injected which explains the difference in porting. Didnt look at cylinder numbers yetIs there a way by looking at the cylinder to tell which I have?
Looking at the pictures, I see many potential problems. You are using the Nova II ignition, which is what replaces that black ignition module in the middle. Plus, the Nova doesn't like the heat under the flywheel and quickly goes bad.
Get a new Nova, hook it in line with the kill switch next to the carb, and put a ground the Nova. Then cut the wire to the black ignition module and tape it off.
Very simple repair and should keep the same timing.
P.S. You will need a flywheel with two magnets 180 degrees apart.
There are smaller spike bars available in Europe. Both inner and outer. If you have a contact there, you should be able to get a hold of them fairly easily. I have a set on one of my saws, and they work very well.Recently got a Dolly 6421 it has rather large 5 point dogs. Are there smaller dogs available?