It is no surprise that the Rocker Panel Trim for the 56 Mercury is longer than the one for the 56 Ford, given that the Mercury has a longer wheelbase. However, imagine my surprise when I opened my parcel from the USA and see that I got one of each? Luckily, the one for the Mercury was the correct one that I was missing. You can also see that the two pieces are completely different is style as well as the length.