Rubber liner is molded to fit the rear wheel wells of your 2500 Sprinter. They do have a little extra space for you to add sound deadening. They start loose, and over a year they will shrink and hold tight.
They've got a small flange at the perimeter, so they'll fit up against a wall, or a floor.
These are the black versions, we also carry grey. find them here: Grey inner liners
* Round dimples go on top during install