One caveat is for cars that are an automatic and have a button on the shift knob - for those, you have to buy a replacement shift knob that also has a button in order to maintain the functionality of the knob.
Some shift knobs are car specific and will thread onto your factory shift lever. The key thing to look out for is that there is a difference between automatic and manual shift knobs. Universal shift knobs use a universal set-screw attachment and include a finishing ring.
Q: Do shift knobs fit every vehicle? A: Shift knobs are universal, which means they fit most cars and trucks.