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					Originally Posted by  JFP in PA
					 
				 
				It is a Y.  What size (wrench size) was the nut on the IMS center bolt? 
			
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Not sure and can't locate that nut at the moment. But here are some pics of the installed nut, IMSB flange and a view of the bearing. It's definitely not a replacement engine and appears to be a dual row bearing. 
Bearing in car is labeled as "NSK 6204 DUA 17 Japan"
Is there something else you were trying to determine?