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From: What do I know anyway? I'm just a 50 year old No0b
These guys make a quality product that a number of people on the forum use. I have a black one with red flames on my '89. Goes well with the red interior. Their delivery is pretty slow but the wait is worth it. I ordered the LED light to go in side the ball but can't use it due to the reverse lock-out on the early ZF shifters.
From: SCMR Rat Pack'r Charter Member..Great Bend KS
No pix (at work now), no linky...but the Hurst shift **** is the cat's pajamas for us old-school hot rodders. It's a BIG ****, for sure; about two inches in diameter.
Just make sure you get it in white...
2020 Corvette of the Year Finalist (appearance mods)
C4 of Year Winner (appearance mods) 2019
9/16 x 18 sounds about right. (I measured last summer, but can't totally confirm).
You can buy a 9/16" x 18 tap at a hardware store for about $10. (I'm going to re-tap a C5 "pool ball" ****). That means you have more options than "advertised". I've seen nylon sleeves for conversion as well. (This assumes you buy one with a smaller hole with adapters).
I'm guessing your 93 doesn't have the reverse lockout -- which also makes it easier.