20v mains & big end bearing

[izanagi]

Hi everyone,
I'm replacing the mains & big end bearings according to the FMS. I did the sum with the 5 digits and it gets me the number: 22233 for the mains bearings.
As I guess, one digit is the size for one journal.
My question is: where goes my first size (2)? The front (oil pump side) or the rear (rear oil seal side) ?
Same question with the 4 digits for the big ends bearings (1222). Does it start at the first cylinder (front of the engine) or the rear ?

Thanks for your help.