Here is a parts diagram -tell us which part number you are calling a "plug".
M96.20 Camshaft M96.21/22 Driving Mechanism M96.23/24
or:
http://www.pelicanparts.com/techarticles/Boxster_Tech/14-ENGINE-Intermediate_Shaft_Bearing/images_small/Pic019.jpg
Reluctantly I did what Jake asked. Mine had an LN ceramic IMSB that had less than 1000 miles on it when #6 c/s bearing was damaged.No fault of the LN part.