hi im trying to do a rear headrest conversion i just want to know how i should be going about it? i think i may practice on my old rear bench from the cab and once i master it i will attempt it on my current interio. i need some advice on how to go about it iv manager tro source the headrest the black bits that they go in aswell as the metal bits that are in the seats! i sourced them from a pair of scirrocco fronty seats! help is needed