When I was looking last year I found the MOMO adapter for the early 914s (#8000?) seemed to be the only solution but it was out of production, rare, and expensive when they come up for sale.
But I did find a solution. I have not installed it yet, and that was a Luisi steering wheel adapter available at:
https://classicgarage.com/lustwh.html It was a bit confusing but they said I needed the "American" version which I assume it the one with the A after the number on the website. I bought a used MOMO wheel and also a J West eccentric adapter, for some added leg room and better view of the gauges. I sure hope it all works!