if its a proper bodykit off full resto job then why not paint it white, then wrap it that dull flat grey that you are looking for.... that way the paint underneath is perfect.and protected if you decide to sell later on its just pulling off some wrap then.

or if u want grey, theres a shiny metallic grey that looks similar,but is shiny ,and glimmers in the sun. reyland put it on his firenza,think its an audi colour(or mercedes does it too---its proper lurvely)

theres also shiny red on ans1 that looks fantastic.

youre stuck for options on s1 as they only really look good in some colours- red, black,and silver. tbh,my opinion only.