Product review (4 stars): fits fine different design
The knob broke that was on my Viking hood.  The hood was 12 years old.  In looking at the old knob the design was not very good around the area where it met with the dimmer shaft.  I ordered two new knobs.  Good thing because the style changed slightly.  But the price I got them for shipped was considerably less then if I ordered directly through Viking, they wanted $15 to ship them.  The design also changed on the knobs where they meet the shaft of the dimmer.  So if you have an older Viking hood and you have two knobs you will want to order both unless having two different styled knobs do not bother you.