This one is in a 521.
I can't remember what I pulled it out of. Maybe a ford f150 ? If you get one from a full size you can always cut down to exact fit. Fairly cheap at the yards during their sale.
Does help with stuff sliding around.
I actually stumbled across that willtheyfit site a couple of days ago. Looks like the wheels I'll be getting will poke out some so it might be time for a fender pull.
**deep breath/fingers crossed**