We did this to our Equus after we purchaced them. The first was a 2013 Signature in 2016 the second was a 2013 Ultimate in 2017 and the third was a 2011 Ultimate also in 2017. The 2013 Equuses also received the vertical grilles as well and the Signature"s shift console was replaced with the ultimate's rear entertainment unit as well. They serve as Limos in our fleet. No names are on the outside of them so the mystery continues as we bring our guests up in these. There are 3 different types of headlamps that will fit in the Equus. I bought both the alternatives after extensive research. Most components interchange amonst these cars but the wiring must be modified between the signature and the ultimate (prestige) version.