Forks are usually talked about using the outer diameter of the steerer tube, not the inner. If you've shopped an 1" fork it is unlikely to fit your bike and headset.

And what do you mean by "I tried to fit my marzocchi dj3 on it"?
Did the MZ fit your headset?
If it did, the odds that you actually need an 1" fork suddenly plummeted even further. Measure the OD of that MZ steerer, it should come up as 1 1/8" or 28.6 mm.