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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I have the CS 1.2's.  I asked Madisound about some replacement speakers and they recommended the  SB Acoustics SB17MFC35-4.

I run a pair of SB Acoustic SB17NRXS35-4 in the front of my Civic and LOVE them!  They say my 4ohm speaker is 170mm and these SB's are 4 ohm 171mm, so it should fit.

The other option is to get the original speaker repaired.

Honestly though based on my cars speakers I am almost willing to try it out.
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 . .