I took my original center caps from my oem wheels and put them in my neuspeeds and they fit perfect. Years later before I got rid of that car I put the original wheels back on and the center caps no longer fit tightly in the oem wheel. They still fit the neuspeeds just fine, but they sat too loose in the oem wheels they came from.It seems hit or miss with Neuspeed wheels for some reason.
I had black 18x8 RSE10's on my GTI, and had the red ring CSS center caps that fit fine. Now I have gunmetal 19x8 RSE10's on the R, and the same center caps are too loose.