I'm in the process of mounting a Mutazu trunk box.
MUTAZU Motorcycle Trunks I've got about $150 in the new box with the "deluxe" rider back rest pad. Matching paint will be about $200 and I had the back rest pad recovered for $25.
The boxes are plastic and not fiberglass. I like the size very well but will see about strength as time goes by. You get what you pay for and I went in knowing what I was getting.
Had the backrest pad recovered because it was a dark dark gray and didn't come close to matching the Corbin. The upholsterer used some "scrap" or leftover material and while it doesn't match perfectly it's pretty close and I didn't want to spend big bucks to order one yard of material.
The boxes are "prepainted". They come in the colors available only. Not even only primed.
Pictures to follow.