4 PCS Car Door Lock Knobs, 0.4In x 1.9In Durable Metal Vehicle Control Post Pins Replacements, Universal Automobile Interior Door Lock Knob Accessories (Silver)

They tell you they fit but they don't fit.

I had lost one rear seat release knob from my Nissan, so I thought I would try one of these "universal" knob replacements before dropping probably $20 at the Nissan dealer for a matching knob. Somewhat to my surprise, it does fit. The screw that it fits on is 4 mm in diameter. I think that these replacement knobs are just smooth plastic inside, which is how they could fit a number of different screw sizes, and claim to be universal. So if you are missing a knob, give these a try. These are fine for door lock knobs (does anybody have those any more??) but they are pretty small for other situations.