rusthater,

What you are looking for is an adapter ring that is welded to the original hub cap. They are provided by the wheelsmith in So. Cal. They also provide the service to convert your hub caps. Being in the UK, getting the adapter rings would be the way to go. They also have some early Chevy hub caps that fit the smoothie wheel without the adapter.

The owners name is Bob Sage.

Website address
www.thewheelsmith.net