There is a turtle knob in the classified section every other week (of course I'm exaggerating), but it comes up often enough that everyone has one now. That isn't "rare". And I think you may have forgotten how you found your tk, it was I who referred you to the guy whom everyone on the forum knows had 5-10 of them at the time kept in his sock drawer
So what's rare imo? The Zele shift knob. That is truly a rare jdm piece. Only 2 or 3 have been seen for sale on the forums in the last several years! I would have gladly paid the asking price for the last one that showed up here last year if it hadn't been badly abused.
And $2,000 for a pair of 12 year old seats that no one can confirm fitment? Good luck with that. There is a set of 40th anniversary seats for sale now in the classified for far less. I would look into that set, at least we know it's straight bolt on, all the connections are there for the air bags and seat warmers.