[T3] Gearshift knob

[Gary Forsmo]

I went hunting for a metric bolt and nut that would fit the threads on
the standard, black Bakelite, manual shift knob.

After several dead end hardware (Ace, Lowe's, Home Depot, etc.)
stores, McMaster-Carr catalog, lumber yards that have a vast array of
nuts/bolts/screws, I had almost given up.
The last try was at a "old-time" lumber yard that had one of
everything and two of most everything else.  You know the kind of
place.  The world had passed them by about 50 years ago. They didn't
have the nut and bolt but they suggested Discount Auto Parts.

What the heck ... one more place.

What I did find was a guy who said: "If DORMAN Products (you know, the
black and orange metal drawers full of everything in nuts/bolts) makes
it, I've got it."

It turned out he DID have several bolts of various lengths of M12 and
pitches: 1.5 (medium); 1.25 (fine) and 1.75 course) pitch bolts.  He
thought the three different pitches were unique to M12.  ???

So here's my question:
Did our standard, manual shift, lever have a knob with a nut UNDER the
black Bakelite shift knob?
Or was a M12 1.5 pitch nut only used under the (accessory) Walnut
Gearshift Knob?

Gary "Frito" - '69 Variant, FI, MT
Rockport, TX (winter)
Lake Geneva, WI (summer)