Obstacle Avoidance Vehcle

We will be making an Obstacle Avoidance Vehicle for our Final Year Project, so far we have bought the Materials needed listed as follows :

So here's the thing guys, apparently the Universal PWM Stepper Motor Controller as shown on the image is capable only on controlling 1 motor . Now I'm kinda confused on my decision if buying 2 PWM Stepper Controllers would still be okay. Any suggestion would be highly appreciated. Thanks in advance.

Both of your links throw up 403 errors (Access Forbidden).

However, they do work the second time you try it... weird.