Thiel Tweeter issue


I have a set of used Thiel CS1.2's I recently bought cheap. Of course they were a little dirty, but at low levels sound great! At higher levels though, the tweeter sound harsh, and has got progressively worse. I am having an issue finding a 25TAC/GW-TH H420 60hm 26/90 tweeter replacement. Anyone know a solution? I would be willing to change both tweeters to match, if a different tweeter would be an improvement over the original. Any help would be great! thanks.
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Don't, a car can sound good with 4 speakers that cost 10 bucks for all 4.
Open both doors and stand a foot away and see how the sound is then .

I had a Nissan Maxima with 8 Bose 901 speakers in it , sounded fantastic .
My Car is a Coupe, so I only have 2 doors.  The stock speakers still run in the back But not real loud, I have always been a fan of front stage.
Doesn't matter how many doors you have, point is a car is easily pressured by sound, few rooms are . .