Let's say that, the original ones suck.
I designed these to use nothing but the hardware that you already have because it came in the box, you will need the hardware you are already using plus 9 nuts to attach them to the carriages.
The parts look a bit smaller than they should because they will act as a spring to hold everything sturdy an straight.
Please notice that if you intend to use them you will need to move the extruder motor to the top of the tower (you will have to do some soldering to extend the cable) and lower the endstops to avoid hitting it.
One of the pieces needs to be rotated upside down.