The seller may be wrong and correct.
To disambiguate, LN does make a dual row IMS retrofit bearing for cars that came with a single row bearing.
Porsche does not install them.
https://lnengineering.com/products/the-definitive-guide-and-faq-for-porsche-ims-bearings/ims-retrofit.html
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I am not an attorney, mechanic, or member of the clergy. Following any advice given in my posts is done at your own peril.
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