So you're building a 2.5L and trying to source the right parts? This can be tough. The Duratec platform shares a number of pieces to the puzzle but bearings aren't it! These are properly sized bearings for the Duratec 2.5L that's commonly used in the NC Miata swap and potentially many others. 

If you have not had a catastrophic failure (rod knock) it's very unlikely you'll need anything other than the STANDARD size bearing but we try to keep inventory on all of them.