Yes aluminum spinner.
The ply washer idea was a bad idea and should not be done IMO. There is a degree of danger with something spinning at near 10,000 rpms, the backplate of a spinner should DIRECTLY contact the drive hub of the engine. A ply anything in between can slip and cause a potentially hazardous situation.
The aluminum spinners do not recess like the plastic ones and look nice as well.
Drawback? more costly and along with the spinner you would probably need an adaptor kit for your engine.