Don`t use a aftermarket lock ring if you help it. The metal wasn`t as good as the OE one.
Reuse your existing metal lock ring, if at all possible. I agree, the aftermarket lock rings are made so once as tight as they will go, the sender is still loose and it WILL leak fuel.
The aftermarket gaskets work fine with an original lock ring. There are
hundreds, wait thousands of people complaining of those aftermarket lock rings being junk (from China, no less) - unless someone finally fixed it in last couple of months (which is unlikely).
BudW