If the two coils in each stepper are correctly wired, but turn in the wrong direction, simply reverse the connection, so that what was coil 1 is now hooked up to what coil 2 was hooked up to. It will do no harm, just turn in a different direction that expected. Check the continuity with an ohmmeter to make sure you have the connections to the correct terminals pairs on the stepper. You will only find continuity between two terminals that ought to be connected as a pair.
The cables with connectors are sometimes in an incorrect configuration for your particular stepper or driver board, and may need pins moved. I found that with some components I recently bought. What should have been connected to 1a and 1b was in fact configured so that it would connect to 1a and 2a, and thus not work.