I have a set of chrome knockoff ZR1 wheels. I bought them used and they were missing the rear centercaps, so I bought a set of the plastic SLP centercaps. They don't seem to fit the wheels. The diameter of the cap itself seems fine, but the tabs to secure it to the wheel seem too large or something. It seems like I might have to take off the wheel to install the caps because the "top" of the tabs don't have quite enough room to snap in between the axle hub and the wheel itself.

Is this typically how ZR1 caps are or do I need to find caps specifically for these knockoffs somehow?