I have a few of the Amaran 528's and so I made diffuser kits for them.

Parts - 4 x M2 12mm bolt 4x M2 nut 4x M3 16mm bolt 4x M3 nut 2x 1/4-20 1" bolt 2x thumb screw (https://www.thingiverse.com/thing:11848) 4x 9mm pipe or rod (I used copper pipe - length is dependent on how large of a diffuser you want - I used 30cm)

You will need to measure out your diffuser material and cut it to size, hem the edges and add elastic in the corners to fit onto the hooks - you may want a few pieces to be able to add more diffusion layers.

Made in Blender 2.8!