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Nissan stamps it into the block after carefully measuring it. So you need to look in a FSM to figure out what size you need. The block has a grade stamp, the crank has a grade stamp and by looking on a matrix in the FSM you can tell which bearings to use. The rod ends also have the grade stamp but no matrix needed as they are not nearly as precise of a grading.
CONNECTING ROD BEARING CLEARANCE
Standard: 0.020 - 0.045 mm (0.0008 - 0.0018in)
Limit: 0.065 mm (.00256 in)
CONNECTING ROD BEARING GRADE NUMBER:
Crank pin grade number 0,1,2
Connecting rod bearing grade number 0,1,2
(What ever is on the crank that will be your grade gor the bearing)
IDENTIFICATION COLOR
GRADE 0; NO COLOR
GRADE 1; BLACK
GRADE 2; BROWN