I happen to have a NOS 38mm Marzocchi front end, but it's destined for the Japauto build. It was hanging on the wall of a warehouse in New Jersey when I heard about it. Evidently it was made for Japauto, because it looks identical to a CB750 K0-K2 front end, has a rhino horn triple, and takes all the CB750 Honda parts: axle, brakes, bearings, gauges.
I flew overnight to New Jersey from San Diego and slept in the NJ airport so I could meet the seller outside in a snowstorm and buy the front end. Then I turned right around and flew back to San Diego.
BTW, the last one of these I heard of was on German eBay, was not NOS, and was $2400. That was many years ago...
RR