There is actually a plate on my D2-40 engine showing that it is a Perkins 404C-15. As someone has previously noted these are Perkins Shibaura units, check your engine and you may well find such a plate. After that get your parts from a Perkins dealer, I have used 'parts4engines' with great success my latest being a fuel pump at 30% of the Volvo price. mind you I am still looking for a replacement air filter which will not increase the noise levels, any suggestions
https://www.aliexpress.com/item/32904371656.html?gps-id=detail404&scm=1007.16891.96945.0&scm_id=1007.16891.96945.0&scm-url=1007.16891.96945.0&pvid=9101deef-bd4b-4d00-b4fb-820476660028
I connect it on D2 55
workes perfect
Bavaria 37 (2006) - similar label