Instructions? No. But the o-rings are pretty easy to do on the cars I have. I have NOT looked at the connections on a Benz. But if I assume they are they same then all one needs is an AC connection decoupler kit. They are plastic, and over-priced, tools that come in several sizes. They open up then close down on the tube. Then you push the tool into the coupling where it spreads a round spring that is holding the tube in place. Hard to describe and I do not have pics. Then the line backs out. Usually two o-rings per connection. Just VERY carefully remove the o-rings and replace. Best not to try to cut of the old ones, any metal nicks will be very bad.

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1991 560 SEL / 185k miles
1992 750il / 17k miles - project car