Thanks for posting those KC. They are the 15x7" wheels and that should be stamped somewhere on that wheel. You can measure from one nub to the other to determine hubcap size.
Here is a pic I found of a 16x5; you can see the wider gap between the rim and the center.
I just discovered they are 16x5's
https://www.ebay.com/ulk/itm/141836918294
The 15x7's are always a great find, they do make the taller tires for them and they allow use of disc brakes.