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Ok, you're actually thinking of S06E07, "Ball and Chain". The ep you mentioned is S05E15, "Anniversary".

I'd recommend that you just download the subtitles for season 6, here and go through the one for 607. I haven't seen Kramer vs. Kramer but checking the quotes on IMDb I don't see any good matches. I'm guessing that when you're going through the subtitles you'll see what you're looking for.