As the others have said, it takes a standard 1-1/8" pressed in headset as opposed to an integrated headset. Whether you need threaded or threadless depends on your fork and/or stem.
For others reading this, Integrated HS vs. pressed-in cups depends on the frame, threaded or threadless depends on the fork and stem.
Theoretically there are four possibilities (not counting a change in size) but threaded integrated headsets are truly rare if they exist at all any more.
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