Yes, the universal shift knob fits for the TH8A with the smallest adapter. I had the silver adapter only a few days. It was looking to tiny. Size does matter...
Right now this is my current shift knob.
https://www.ebay.com/itm/eBayISAPI.dll/272030490627?_mwBanner=1
This knob is really long. The only problem is that the adapter fits so tight that you will never get thr knob off tge stick again. If you try to remove it you will twist the whole stick off the TH8A. The good thing is that it will never get loose.
Tomorrow I will get a vacuum hose to make the stick of the TH8A a bit thicker. At tge moment it is looking really stupid. A really big knob on a thin stick.
I tried out some shift knobs the last days.
I play on PS4.