Does anyone know what the propper string length and brace height for a bear kodiak 45# and 60" AMO would be?

The AMO length of 60 is the length you would order.  I just picked up a string for my grizzly I dusted off. The AMO was listed on the bow at 58 which is what I picked up at Cabelas.   Some string order forms I found out list them where you have to subtract 3 to 4 inches which is actual length needed.  Hope that helps

Just get a flemish twist string for a 60" bow from one of our fine sponsors and start with a brace height of 8 1/4". Go from there.

If not, get a 56" string.