On a 126 it is not quite bolt up because of the bottom headlight bracket where the wiper motor attaches on to. The US and euro wiper systems are quite different and this is the reason. Although I have never done a 129 conversion, I am confident that it will be nothing more than a bolt up since (I'm 98% sure) the wiper systems are the same. Good luck!
Although she's not my wife (yet), I wish my girlfriend had a V-12 Mercedes! I guess I'll have to live with her Saturn
