I keep my UMC in the empty space on the left of the trunk that is not covered by the trunk mat. Right now the UMC sits there sticking out randomly. I would like to get a bag that fits that exact gap, and store my UMC inside it. I found this bag designed to fit a similar gap in the trunk of the Model S. Do you know if the size of that gap is the same in both the Model 3 and the Model S? Will this item fit properly in my Model 3?