What kind of shift knob would fit I have no idea.

How to get it off, I might know:

1) Peel off the boot from the knob a little. Under the shift knob there's a nut. Unscrew it (clock wise, it's upside down)
2) After the screw comes out you can unscrew the shift knob by turning it counter clock wise.

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"The MB W123 is so bulletproof, you can drive them forever. Which is a good thing as it takes that long to get anywhere."
Betsie: 1984 W123 300D (hobby, 280k miles)
Myrla: 2001 Mazda Protege 2.0 ES 5spd (daily driver, 130k miles)
The Turd: 2007 Toyota Camry (wife's car, 118k miles)