I've seen a few Charvel guitars with black covered Charvel pickups. I've also seen them with black covered Jackson pickups. On ebay, this guitar body has Charvel pickups...but the description says that the humbucker says its a Jackson pickup on the back. So are those singles J-200? http://cgi.ebay.com/LOOK-Custom-Fire-Eye...1QQcmdZViewItem
In later years there were Jackson labelled pickups that were not made in USA. For instance the pups that came in the Performer series and Euro-X series. These sounded really crappy. And now (I believe) we can also add the CVR-2 pickups in the JS series to this list.