I have a winsun (chinese) vtwin diesel engine that I am trying to find oil filters for. The filter that comes on the engine when it is new is a Boshi B0-6003B...I have found the Boshi site and it shows a dihatsu oem filter # for a cross reference but I cant find anything further than that...what's stupI'd is its a chinese engine and has a 3/4-16 thread ...go figure lol.....the physical size is identical to a ph6607 but with a 3/4-16 thread instead of a 20-1.5 on the ph6607...I use the 6607's on my kubotas that's why I had one around to compare...I have tried most all the big name cross reference pages with no luck so far...Thanks in advance for any help ..David S