Attach X stepper mount to the X 2020 with 2x M4x16 button head screws and M4 lock washer into the original outside mounting holes. Make sure it is flush and straight.

Like the right side attach the X stepper mount to the left Z stepper mount with a M3x10 button head screw and M3 lock washer, On the other side a M3x40 socket head cap screw into a T nut and a M5x8 button head screw into a M5 T nut.

This step is crucial. The X axis needs to be parallel to prevent the Z steppers from getting out of sync causing the 2020 to become crooked. I used 2x 90 degree clamping squares.