Indeed, Wikipedia mentions "The SK-105 was developed by Saurer-Werk (now Steyr-Daimler-Puch)"
I updated them:
https://www.imcdb.org/vehicles_make-Saurer_model-SK-105+K%C3%BCrassier.html

I've also changed the Jagdpanzer as Steyr:
https://www.imcdb.org/search.php?resultsStyle=asList&sortBy=0&make=Steyr&model=J- g.Pz.VI
Should the origin be Austrian or is German right? (and in the latter case, all should be set as built in Austria?)
Also, should all be Sd.Kfz. 186 or is Ausf. B right for the three that were listed as Nibelungenwerk?