It will all depend on two things:
1. What process you need to use, ie. die casting, cnc machining, metal 3d printing etc.
2. What drawings/files you have.
2a. How many you want made.
Do a search on "Low volume casting" to find services that could probably work from your original part.
https://www.xometry.com/ (places like this do mostly additive or subtractive manufacturing, although they do offer die casting, they would probably want CAD models of your product.)
https://precisecast.com/ (places like this offer low volume casting and could probably work from your original part)