[Steve Tinker]

I'm willing to bet NSK (or any other supplier Porsche may have used) have no details of the IMS bearing installation.
Porsche design engineers would have finalised the complete engine design and then sent out pricing enquiry's to several bearing manufacturers requesting supply and delivery costs for so many thousand of type xxxx bearings.
NSK, FAG, Timken, et al, are not players in "in house" designs (unless specifically asked), their products are catalogued & sold around the world to conform to international numbering identification specifications - its up to the design engineers at Porsche to specify the size and type of bearing to be used for the application.
To quote landrovered, The supplier is not at fault.......as long as he supplies what Porsche asked for.