Hi, Steve
Your stepper motor's are 5 wire Unipolar Type, Gecko's use Bipolar Type, 4, 6, or 8 wire Motor's.
Look on your motor driver board/box's and see if it has a diag similar to this picture below, They do make some step/dir boxes, But I couldn't find the part # you listed.
Hears a pic of the stepper diminutions for your motors also.
Chip