While modern BMWs use hard plastic reservoirs, this yellow washer bag fits several classic and vintage BMW models from the 1960s and 1970s. Often found in the engine bays of classic BMWs from the 1960s and 70s, such as the BMW 2002 (E10) and the E9 Coupe.Universal Compatibility: Because it is a soft bag with a simple mounting bracket, it is often used as a universal replacement or for "clean" engine bay builds in various BMW models where the original bulky reservoir has been removed. The yellow cap/valve is a signature VDO design that often includes a built-in check valve or venting mechanism to prevent fluid backflow. These bags come with it.