The B16 ones at Brookhouse don't show a rubber ring but say to use the paper gasket that is applicable to B16. I have some used ones that came with those PV parts mentioned and they all have the rubber that goes around the edge like a grommet. They are 80º or 83º.Can't see if your rubber has a groove to allow it to do that. The ones I have are all non plunger B18 types which is why I think they are B16. I might be wrong but I don't think that the B16 uses the bypass plunger. I could look that up.
https://m.cvi-automotive.se/en/artic...at-b4bb16-80-c
https://m.cvi-automotive.se/en/articles/14382/1-b16
I have an 83º one like this which looks unused but it does have the rubber ring.