Visually, they appear similar to the ones on my 14 x 5.5 rally wheels. Brush finish, with a sharp transition from the rim to the inner surface. However, there is one difference — yours appear to have a lip on the inner edge (where you hooked your tape measure) — on mine, the sloped surface just ends. I don't know if this affects the fit.
There is another style that is polished and has a rounded transition, that you often see used with dog dish caps.
If they fit, I see no reason not to use them.