Don't make the mistake I made, I bought a second hand one off Ebay to replace a lost cap, the Ebay one appeared in perfect condition but didn't seem to click firmly into place no matter how I tried. 10 miles up the road it departed, never to be seen again.
I then purchased these:
Every JBW wheel is manufactured to the highest industry standards. Our wheels are manufactured to ISO16949 standards and have been JWL (Japan Light Alloy Wheel Standard) and VIA (Vehicle Inspection Association of Japan) approved.
www.ebay.co.uk
They click into place much more positively and arrived with centre cap stickers so they look like these:
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View attachment 113957
I've driven over 100 miles and touch wood, they're still on.