What size diameter tips for dumps?

I need some tips for my mufflers and don't wanna spend $ for tails besides I kinda like the sound. The mufflers I have are unknown replacement mufflers 2 1/4" they were on the car when I bought it. Just says made in USA and have a part # 41xxx can't remember. Pretty sure they're stainless though but by lookin inside they look like regular cheepo "turbo" mufflers. I just swapped the original system back in cause I'm sellin the old setup. Anyway I got a pair of 2 1/4" flared tips to use but they don't fit. They just match up to the openings on the mufflers. Should I go with 2"?

I see what you're saying. But my Flowmaster cat-back I had on for example, the tailpips slipped inside the mufflers. And these mufflers I have on the car now looks like they were the same way, I can't remember how the original tails were on cause one of them rusted through so I just chucked them. But the mufflers have sorta "opened" up ends, wider than the actual inlet/outlet that goes through the muffler, know what I mean? I'll just go back to Advanced tomorrow and return these and play around with a different size and find one that fits. I also saw these chromed tips that go bolted on, but was iffy about them cause they have these screws that hold them to the pipe.