Technical What year is this hubcap?

Howdy, my 66 GMC has these hubcaps from a pontiac on it. I like them because of " dogdish " look and the rocket style logo. One is a bit battered. Anyone know what year(s) they are? I would like to purchase one or more for replacement and spare. Thanks for positive replies. Rick

 

57 oldsmobile I think. Definitely not Pontiac.

Edit-58, not 57. See ebay item 125039549960

 

That’s an Oldsmobile rocket.

 

There are some up on eBay, for not to many coins.

https://ebay.us/m/1yqSsp

Some offer free shipping, too.