Gen 2 won’t be compatible with the Gen 3 mounts. The Gen 2 mast section is slightly too big to slide into the Gen 3 mounts. They just recently discounted the Gen 3 Ridgeline Mount, normally the Gen 3 is actually more expensive.
You could go with a 3rd party option and supply your own weights. That would save you money vs buying the Gen 2 Ridgeline Mount.