The ebay seller I got the rod from took the one I had back, and is going to send out a replacement. After getting that arranged, I actually contacted autostars_inc on ebay, and told him that I was interested in the shift knob you had, but with a different thread pitch, to match the rod I hope will work right. Even though the shift knob I got was ok, it was a bit small, and I like the size of yours better. He told me to contact SickSpeed directly, and see what they said. Tony @ SickSpeed was very helpful. He found the exact knob like yours, and said they can send it with a 10x1.50 threaded insert. I didn't even have to order that separately, it comes with it. Once everything arrives, I will compare the two knobs, and go with the one that works better. I'm still committed to trying to make this mod work. I really liked how it felt. Hopefully the next shift rod will work right.
Extra bonus - SickSpeed's pricing was better than the ebay pricing...
Watching this with interest @glwood. Thanks for being the guinea pig on this mod!