There were many types actually, but if we stick to the genuine items it goes like this.

Premier models had a fine spoked, bright finish wheel trim (held on by the standard hub cap) & this was also available as a Nasco accessory on Specials & standards. GM-H call this trim 'Turbine style'. I use the words 'bright finish' because while most are chrome plated steel there was also a polished alloy type which appears outwardly identical. For the non believers, check the parts catalogue.

There were also a few others available as Nasco accessories. The EJ Premier type was available as the De-Luxe Wheel trim. There was the 'Fiesta' full wheel cover trim, which had been around as an accessory since the late 50s & there was also the very rare Nasco white plastic wheel trim set.

In the aftermarket there were many more made, usually of anodised aluminium, from companies like Karinna (spelling ?) etc.

Dr Terry