Second the vote for TAD. They are the Perkins marine go to on this side of the pond. They will send you the parts diagrams and if NLA new are a good source for used and reconditioned parts.
Can you post a picture of the broken part?
Some of those are common to automotive.
There is a turbocharger repair shop in Albany. Someone on here posted about a few years ago. I don't remember the name but Google is your friend.
You might also try Trans Atlantic Diesel . Get the specific engine engine serial number
and model and phone them and ask.
Trans Atlantic Diesels | Perkins Diesel Engines | Perkins Engine Parts | Cummins Diesel Engines
I’m not 100% certain this is the part BUT if it is TAD has new manufactured out of of stainless steel. I replaced one this winter that was bad, leaking exhaust at the riser connection. They come with a blanket. You will also need the stainless rings that mount between the riser connection and turbo side connection and 2 new clamps.
I believe the entire package, was approx $900, the “turbo pot” was $650.I distorted the clamps when removing so new were needed and new stainless rings are necessary. I purchased these in Feb 2022. The old pot deteriorated at the exhaust flange. Simple repair but costly.