I got mine from 4 ashes aston martin
https://www.fourashesgarage.co.uk/t...r-in-car-use-or-workshop-42mm-not-jaguar

They don’t show/advertise it but if you email them they do make them ( as the description in the 2 eared version states)
The 3 eared version isn’t cheap, but fully encloses all 3 ears and has a centre ¾” centre for a driver.
They need to know the wheel centre diameter (should be 42mm)

Video I hope...
https://photos.app.goo.gl/zSRF3owjMkh2CZC49

Works well
Howard