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Been running the VBP wheel adaptors for `12 years now, driven daily, when it's running....recent 'issues' force the comment there....
but the wheel adaptors are not involved one bit.....they are fine...
there is a distince differance between an adaptor and a spacer, a spacer it totally unsafe....an adaptor uses ten bolts to take off the rotor, for instance....5 for the wheel, interleaved with 5 more for the adaptor...
Those appear to be identical to what VB&P sells. I'm thinking spacers are the ones that have a universal bolt pattern to fit GM, Ford or Mopar, relatively thin, and don't index to the hub. Not safe because the wheel is no longer indexed or "located" (wheel is physically in contact with the bearing hub) to the hub, therefor the wheel lugs bear the entire load. I have a set of VB&P adapters, they are difficult to remove because it's almost a press fit when they're indexed to the hub. These look more like adapters and state they are hub-centric, meaning they are in fact indexed to the hub.
If sandwich-style spacers are unsafe because the studs take the load, then 99% of aftermarket wheels are also unsafe because they are not hubcentric either.
I have a set of 2.25 and 2.5" VBP adapters I'd be willing to sell, complete with both sets of lugnuts necessary to install the adapters and your wheels. $250 plus shipping for the set.