I bought a good tranny for my wife's 190D and they had the same requirements (change seals and send them the proof of purchase for the seals to get the warrantee)
I did not and its 1 yr and no problems so far.

__________________
1982 300SD (214 k, excellent shape) kidmobile running mostly biodiesel, gets 31 mpg hwy with 2.82 rear from a euro 500SEL



1976 115 body 240D 4-speed (traded for Jeep parts) - Engine lives on in my CJ7