Hello.
A simple googling gave me this:
https://spanish.alibaba.com/product-...117918185.html
https://es.aliexpress.com/i/32842902460.html
Regarding a replacement it should be fairly simple as it is a 48V/3A drive. Just check for the number of step configuration that you require. It is possible that most of the new ones if not all have your configuration.
Regards.