I find unsightly the gap left between the seat and the tail light (when with the solo seat).
Two options to fill the gap in my opinion: either you get rid of the rear buckle but you need to find a new way to reattach the lights and license plate. Or you build yourself a seat cowl.
I like this option because you've nothing to take appart, the problem is you have to be really crafty to make it (which I'm not

.
As anyone an Idea how to make it as easy as possible? Or how much would it cost me to make it done by a professional?
Here is a picture with an without the seat cowl.