I sent this reply to Chris and then relized it might be helpful for other owners...
You might try this http://cgi.ebay.ph/ws/eBayISAPI.dll?ViewItem&item=230580973101 for your Sport badge. The picture shows the size in cm. Lots places have the wheel emblems but I’ve never shopped for the specific grey background.
Hope that helps,
Peter -- 074, Signal Red Convertible