Got this as a throw in with a brush from Ebay. It's 3.25" high. I guess it's a brush stand but all the one's like it that I've seen have a closed back. Wondered if anyone knew what exactly would fit it? Is it made for a specific brush? Also is there a way to even out the color? It has dark spots and was curious if those can be removed? Do you think the 400N would match/fit it?