Mk1 big end bearings

[mark35]

How do I know which big end bearing shells to order.
So have removed the sump and made a note of the the numbers stamped on the bottom of the block. Five numbers 33332 and four numbers 2222.
Stamped on the crankshaft is 00001 so I add these up to workout the size of the main bearings to order.
All 33333 fit the mains so how do I work out the big end ones.