Quote Originally Posted by m_c View Post
I've just a quick ebay search, and something like this kit would get you up and running, provided you can figure out the existing power supply, and get it working for the steppers - CNC Router DIY Kit 5 Axis Breakout Board +3x M542 Stepper Motor Driver 1.0A-4.5A | eBay

If you scroll down the page, it has some pretty simple but clear wiring diagrams, which should help clarify what's needed, and how they connect.
He's going to need motors has well because these are 5 wire Unipolar motors and using them with Bipolar drives is not recommended. At best you get erratic results with high potential for missed steps and at worst will damage the drive.?

Also I'd change the power supply to something with more volts better matched to the drives like 44-46v because looking at those pics I see 26V now chances are this is AC before rectification so could be 36Vdc.? Which is still 10V less than ideal for these drives and modern motors. 10V makes a big enough difference to be worth changing IME.