Well...
I don't know who told you that; but it ain't true. Those strings
are fairly close to the original 43-89 gauge Danelectro strings, but you don't
have to use them - unless you want the vintage Dano sound. My '18 MIK Dano Longhorn came from the factory with 45-105 D' Addario rounds. For several reasons, they went in the dumpster ASAP, but they would have worked perfectly fine for anybody else. It wears La Bella 760FX flats (39-96) now, 'cause that's the sound I want from it. But, other than Hofner, Pyramid, or TI Jazz rounds (their short scale strings are too long), you can use any brand/gauge of short scale round wounds that tickle your fancy. I would hesitate to use really heavy gauge strings on it, but anything in the 45-105/107 range - or lighter - should be perfectly fine. The only problem you might have is with the ball ends; Danelectro likes to cut the slots in their bridge plates a little small. Just be aware of it when stringing it up. I hesitate to recommend any particular strings - but only because I don't care much for rounds...