You'll notice the difference right away because this mirror has over 10% more viewing area than your average side mounted model, but it's designed to fit any standard 17-1/2" span loop. The 4 amp temperature controlled heating element provides quick, even defrosting and prevents the mirror from overheating. A polished 300 series stainless steel outer shell and heavy-duty ABS plastic inner housing ensure durability and good looks. All mounting hardware included for quick and easy installation. Manufacturer's 3 year warranty on materials and workmanship.