Broken Alternator Lug

When I was separating my alternator from the engine block the lug on the main line back to the battery broke
Anyone have any recommendations on how to fix or know what gauge the cable is, so I can try to find a replacement lug? (I would still have to figure out how to cut the old lug off)

 

It’s just a crimp connector from the parts store.

 

If you don’t have a heavy crimp tool, mash it with a hammer and use a punch to dent it?

 

This alternator should be replaced with a new one. It's too far gone to try and salvage it. Use it as a core for the replacement. Get Denso or OEM.

This would work if done properly, or squish it in a vice.

The other, preferable option, is to buy a cheap crimper off Amazon -

$32 Cable Lug Crimping Tool with 170pcs Copper Wire Lugs and 210pcs Heat Shrinkable Tube, Wire Crimping Tool for AWG 10-1/0 Electrical Lug Crimper, with Cable Cutter

https://www.amazon.com/Crimping-170pcs-Electrical-Crimper-Adhesive/dp/B0BJP8RN59

Even better would be to replace the whole cable with a new OEM one since the cable itself is probably also corroded.