If you're not particular on the style. I believe a knob from a Camaro, or even one of the S10 blazers would fit. My Olds console has the same type retainer as yours. And too, if you're in a bind for something I'm betting you can get one from auto Zone or such till you find something better. I have seen them for around $10. The only thing I don't like about those though is the set screw attachment.
93 9C1: Work & Cubic Ca$h This started with a new headlight and fender
Celeritas In Conficiendo