Summit - Hotrod Hardware has two large metal 50s Ford signs on their website. Maybe someone can post some pics.....
They've got quite a few decent Ford signs:
http://www.summitracing.com/search/department/collectables-apparel/section/signs-banners-patches-flags/part-type/vintage-signs/sign-genre/ford?N=4294951536%2B4294951535%2B4294910578%2B4294910576&SortBy=BestKeywordMatch&SortOrder=Ascending&keyword=sign