I think yours was made as a one of a kind.
If you have to have one exactly like it you will have to have it made for you.
If you are open to sugestions I would recommend considering Wilkinson's "quick release hub".
It is made from stainless steel billet. The steering wheel side (that you see) is black anonodized and he had a DT Isis logo engraved in the center.
I know that he has one for the Momo wheels. That is what I have. I don't know about the other wheels.
I have one and am ecstatic about it. It is better then the factory part. It is like a work of art.
There are photos of it on this web site if you do a search for steering wheel hubs.
I will tell you that the pictures do not do it justice. It is better, much better in person thenthe photos can capture.
I was a little skeptical at first but everyone who has it highly recommended it and loved thiers.
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