David,
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I have never seen any adapter offered with the Ferrero 75 mm PCD.
The two spoke I purchased from Europe many years ago was still mounted to the Lancia OEM hub.
as Dennis Q had adapted a Grant removable security key-locked hub to 2511 for the LeCarra Wheel, I wanted the two spoke to be interchangeable with the LeCarra.
The grant security lock is designed for their proprietary three bolt PCD wheels, so I purchased a second security lock (just to obtain the removable wheel-attached portion) and the appropriate three hole to six hole 74 mm PCD adapter.
The conversion done by Dennis used a no-longer-made capri three hole hub adapter made years ago by Grant, so signal canceling is not an issue with this assembly.
Larry