Can you file fit any/all rings?

I always check the gaps on every engine. You never know if one is boxed wrong. Like others said gap depends on piston type, use, etc. Sealed Power usually supplies a recommendation sheet with gap sizes. For HP street stuff i like to run .016-.018 on top ring. Second ring similar. Sealed power oil rings do not need to be gapped, but i usually stick a couple rails in just to make sure.