What you want is the engine model # and serial # not part number. It is located next to the engine oil sump as shown in the attached picture.
There is a difference between a rebuilt and a replacement engine from the factory. factory engines will have 'AT' as part of the engine number like the one pictured below.
The M96 is the engine type and the AT designates it as a factory replacement engine.
All factory issued 'AT' engines have a non-serviceable single row IMS bearing like the 997's from late 2005 to early 2009.
If it is a rebuilt motor, then you want to know if it has had an IMS upgrade to the LN Engineering bearing (ceramic single or double) or another type of bearing. LN issues a bar coded sticker with each bearing. Ask for work order records to see what you are buying. Post the engine number if you're not sure about what you have.
