It is a standard M6x1mm thread for the nozzle.
Do not get tempted to buy the cheapest nozzles you can get just because they fit tough, some of them are produced with really crappy tolerances and rough surfaces, and it does affect your extrusion speed and surface quality greatly!
3dsolex.com you find a list of resellers on this site...
E3d-online.com the v6 nozzles are ok for the olsson block.
Out of my head... I think it's standard m6 thread...
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