I know that Cat still supply nose ends for both booms and sticks (but not necessarily for all models), the last one I was involved in was a couple of years ago. So long as you have some good welders it's a relatively easy job.
To hard to see for sure but the boss on the bucket looks one piece and goes right through the ear? You might be able to just cut it out and machine up a new boss,weld it in and line bore it to final size.
A bloke who used to work for me used to get angry when he come across butchered machines like that. I told him if we didn't have people like that we would all be looking for a job