help with ideas please........

Those mag look hubcaps with holes for long/expensive lug nuts were 13 and 14 inch only. I'm almost certain that type hubcap disappeared after 67.
A 69 mag look hubcap will have the lugs cast/included. Still only 14 inch though.
There probably is a plastic mag look hub cap at Walmart or somewhere that will look OK and mount on that 15 inch wheel.