I've been experimenting with dye sublimation on fabric backed foam. Unfortunately, the cost is unrealistic for the volume that I produce. Which means that for now, I can only supply the black foam.
The Vents bottoms attach to the Spectra frames in a very similar fashion to how they attached to the Vents frames originally. The tabs poke up through the holes in the bottom of the frame. I tried getting a picture, but it kept coming out too blurry to be a worthwhile post.