This picture may help you. This is the view from the rear of the 1-3 case half, during assembly with the bearing carrier (which holds the crank) inserted. To the left is the rear of the Intermediate Shaft (where you can see the end of the bearing behind the flange), and to the right is the back of the crank. The gap between the crank and the case half is where the RMS seal goes.
As you can see, the RMS and the IMS are completely separate, and do not share oil in any way.
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Boxster S
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