Leak at fuel sender, replace tank?

Well its a bit late for using the old lock-ring because i changed the sender about a year ago or so and during that time it didnt seem to be leaking.

Anyhow, before i spring for a new tank i thought i'd try replacing the lock ring/gasket just in case.

I Ordered two different rings. The spectra premium, which doesnt look ideal, but looks better than what came on with my ebay sender and a new gasket(which is making me wonder if my ebay sender had a gasket.)

And the one i'm likely to end up using is this airtex lock ring that looks really nice:


The one that came with the ebay sender doesnt have the nice tabs to prevent the ring from being knocked past the divot.