I just saw this new posting for an open casting call for Ford SF. http://scouting.fordmodels.
Hey, Anonymous! In this particular situation, they won't consider a model that is smaller because this open call is for "fit models." When it comes to fit modeling, it is all about the specific measurements because the models will be trying on various garments for clothing manufacturers. That is why the sizes they're looking for are larger than the norm. You can't be a fit model if you aren't within at least a half inch of the measurements they have posted.
So you'll want to attend a general casting call for Ford to be considered for their other divisions and not for fit modeling. The official website for the agency lists the days and times they have open calls for their fashion models so look definitely check that out instead.