as per the fsm you need the numbers from the first crank counterweight. The top row of numbers (5 total) is for your mains, [the row below that (4#s) is for your rod bearing grades] Then on the block where the aluminum oil pan mates there is another set of (5) tiny numbers. once you have the 2 rows of 5 you add them in columns.. should look something like 11111 & 12222
so in that particular instance you would need the following: #1- grade 2, #2-5-grade 3....if this aint clear enough i believe JWT's and/or SR20DEvelopment's site has that info for bearing selection.. hope this helps.. good luck!!!