I’ve recently outfitted my ‘07 NA side views with Hercules brand auxiliary mirrors. For about $20 they are good quality and stay in place without damaging the OEM mirror housings. They come ready to color match (not yet completed) and greatly enhance the view over the rear fenders. The adjustability range has some limits which can be expanded based on how you set up on the OEMs. Mine are the larger size (2 1/2” x 6”, approximately), fit just right and give ample additional viewing area. (Not sure the smaller size are even available at this point.) There is a bit of getting used to as far as height on the DS with the slight blind spot created. It may be possible to fit these on the bottom of the OEMs but I think the size and shape look good on top. They wouldn’t give the enhanced view over the fenders if they were on the bottom. I ordered a version that supposedly came out of Germany promoted to having a higher quality mirror product for longevity and clarity.