Sending unit O-ring part #?

[DaN]

I'm replacing the fuel tank on my 90 325i, and I want to get all the sending unit/pump o-rings that seal it to the tank.
On real oem, it shows the left sending unit but no o-ring for it.

Is the large o-ring the same for both the fuel pump assembly, and the left sending unit? It doesnt show a part #, what is it?

Thanks

[DaN]

No one ever replaced the o ring on the left side sending unit?
Come on