[ercoupe-tech] Rolls Royce valve covers?

[heavensd]

There are two Rolls Royce - Continental valve covers for sale on E Bay.
They appear to fit small continentals. I also recall seeing sometime ago a
picture of what appeared to be a small Continental engine (C-75, 85, 90,
or O-200), badged Rolls Royce.
Did Rolls Royce ever built small Continentals under license?
Would all parts be compatible?
Would those valve covers be legal parts to install in our planes?
If ever done... Classy?? or Bling??
Eliacim