Mike, if your 0026 does turn out to be an original close ratio five speed car, that would be a VERY special car indeed! As far as I have been able to ascertain, all BMWs of that era that were close ratio equipped from the factory got this shift knob from the 1800 TiSA parts bin. Part number 23411666170
The 2002 Turbos were four speeds as standard, but many were close ratios, and of those that I’ve seen, which is admittedly more than my fair share since... long story. All those I’ve seen that are original close ratio cars, have this shift knob.
If I were the custodian of your car, I’d definitely buy one of these shift knobs while they’re still available!
https://www.bmw2002faq.com/forums/topic/85749-the-rarest-shift-knob-in-the-world-of-02s/?tab=comments#comment-366725
https://www.bmw2002faq.com/forums/topic/262458-genuine-factory-5-speed-dog-leg-shift-knob/?tab=comments#comment-1414321