Hello, Does this set include the cylinder base gasket for the /6 models (R90S) ?
No, this kit does not include base gaskets because they were not originally fitted by BMW. The surfaces between barrel and crank case are metal to metal so BMW intend you to use something like the threebond metal to metal sealant, part number OIA62376.
However, many people do like to use a base gasket. We list an aftermarket base gasket which can be used, this is part number ENA19125.
The choice is yours!