on cylinder #4 it reads b2 on the crank and the rod code is 13 can someone figue the color code out for me

 

B2 is not a valid letter code for the rod journal size. It's probably just "B".

13 is not a valid number code for the rod big-end bore size.

The crank should be just a single letter, no numbers.

The rod should read either 1, 2, 3, or 4, not a combination pair of those numbers.

Using what you've given, I could guess that:
If it's B1, then you need Pink/Pink.

If it's B3, then you need Green/Green.

I've never seen Pink or Red bearings used before.