I had the same knob in walnut and vinyl. I made a few out of aluminum but got too dang hot in the summer. Back to stock that I sanded and clear coated so it looks new.
So, I was over on the Roadster site and responded to a post "Show your Knobs" and I responded....
I have had many knobs over the years (griffin, Datsun,,,) now back to a stock knob. But must say, my wife has the best knobs, but can't post a pict of them.....
And they told me I should be over here... What are they saying???