Here are some stock tweeters...I'd stick with those if you're runnin stock equipment. You can tell if your rear are stock by looking up at the bottom of them from the trunk.
D6 98 99 00 01 02 03 GRAND PRIX SPEAKER / TWEETER | eBay
If the stock tweeters were unplugged, there is a good chance that the p/o changed the stock midrange to a coaxial speaker. You will want to check that and make sure. If there is an aftermarket speaker in there and you connect the tweeters,
the impedance will drop and will blow your head unit in time.