Gas Tank?

Ok, I'm installing a new gas tank cr11e in my 74 Duster. Got a new sending unit with it. The locking ring and rubber gasket fit right in on the Sender, but I read that it might not seal as good. Anybody installed this new Tank with new sender? Any issues with leaking? I can get the ring off the old Tank, but this new one should seal right?
I used the same set up, w/ the orig. lock ring and new gaqsket, the new lock ring didn`t feel right and leaked. Had to pull the tank to do it, due to the closeness of the dana . Be sure to lubricate the filler neck and seal/ keep the neck squared up in the gasket------------