I am about to replace my oil pan, the gasket, both motor mounts and shocks, and the oil cooler lines. I had read this thread and was thinking I might want to replace the check valve too while I have everything apart. I looked at my car to kind of see what I would be looking at and it turns out my car lacks this part all together. There is only one tube going into the top of the upper oil pan and when I felt back there it seemed like it was just a blank spot where this tube and check valve would be. The car is a euro turbo 617 and it looks like the valve cover vent runs directly to the air intake just in front of the turbo. Looks like I will not have to worry about whether the part is still available or not.

__________________
1985 Euro 300TD Turbo