You need to be careful to find the one that is right for your car. I have a BBB and it does not cover the 280SL - published too early. The "Technical Data Books" listed by that eBay seller have lots of data in them, like torque ratings for bolts, fluid capacities, and more, but they are not the BBB and don't have any maintenance/repair instructions.
Rodd
Powell, Ohio, USA
1966 230SL, Euro, Auto, Leather, both tops
1994 E420