Product review (5 stars): Much cheaper than Viking
Fit perfectly and costs MUCH less than Viking parts asked for two little knobs. Used to replace my Viking 6-burner fan and light knobs.

Their tip was spot-on, if the knobs don't go on easy and there looks like two metal layers on the exposed rod knob, that's the inner part of the old knob. Remove that with pliers and you're ready to push these on.