firstly you may need to consider a new gearbox as this meay be cheaper than all new gears. even that costs a small fortune!
the gears have ktm part numbers and come in a ktm box. i suggest that you take the husaberg part numbers and try them on your dealer? cross your fingers!
Note that all of the 'gearwheel' combos in the Berg tranny are different and have different ratios than the KTM RFS models. I don't know whether or not they are interchangeable.