sequential taillights

how hard would it be to put sequential taillights on an 84 aprice classic

i dont like the way the stock taillights look when you use the turn signal so i thought that i would see if its possible to use sequential taillights like on the mercury cougar

thanks for any help

i saw that kit, but was wonderign why it was only for the newer caprices and impalas.
there are a lot of mustang kits out there as well. would they work?

my main question is what happens when you hit the turn signal and the brakes at the same time?
does one sequence while the other is solid?