When Deep Space Nine ended it's run, all of the sets were struck and discarded, with the exception of the Defiant set. It was placed in storage and reused a few times as different ships, and one of those times it was redressed as a Ferengi vessel.
I strongly suspect it is the leftmost dome in this frame.
This particular dome was bought the old fashioned way...Ebay. I didn't have one at the time, and my collection needed one. That hole is filled and now on to the next item.