Looks like late 80’s ford steel wheel with the x9 stamp. You can simply pop rivet the hub cap clips onto them like I did on mine. The other problem I had (in your pic) was the holes in the wheel were actually too big for standard lug nuts. Whdn you tighten them the nuts sink into the hole too far and the flats start to contact the wheel. I used “big bulge” style nuts from the parts store and they worked perfect. One last thing was the “depth” of the clips. When you snap the caps on they will not be tight to the wheel. Mine had about 3/16” of space so I simply used 3 small nuts and tacked them onto the caps to take up the space and now they snap on tightly. Been running my setup for about 10k miles so far and they work great and look factory.
