[iLLuSiVe]

M10 x 1.5 I believe is the correct sizing
The knob from the Si is actually really good and maybe up your alley, it is a decide size and good weight with some leather wrap and metal, I just had a hybrid racing one from previous car so put that in it anyway (it's all metal though so doesn't sound like what you're looking for)

 

[iLLuSiVe]

Acuity shift boot collar is really good. The stock plastic collar can be extremely hard to get off and many of us have broke it in the process. I got the insulated Acuity ESCO knob and I am really happy with it.

^Acuity shift boot collar is worth it, lets you spin it around for different neck thickness/settings of shift knobs so you can get a flush look even if your new knob doesn't match the tapering of the OEM

 

[iLLuSiVe]

Nice!

I got the stainless steel one, to match the plastic-chrome ring on the OEM clip, which was/is about $50 in Dec 2021, plus the trim removal stuff for $12, plus shipping; it came to just under $70 is the way I remember it (over 65, less than 70).

Maybe I'll look harder for where I might have stashed it. I always figured it'd just turn up on its own eventually, but it's been well over a year and it hasn't happened.

Hey, given the timeframe, maybe my wife mistook it for an incoming Xmas present and put it in the designated closet in our attic! (Can't believe I hadn't thought of that until I typed "Dec 2021" as when I ordered it the first time!)

And one more thing I realized - if/when I sell my car, reverting to the stock shift knob would mean disassembly and re-attaching of the old ring, right? Or I'd have to pass along the knob I have on the car.

You could put the old knob back on with the Acuity collar, but if you can manage to get the OEM one off without damage and could swap it back on that's up to you, depends how attached you are to the money spent on the collar lol