1926, 1927 or 1928 Buick/ Cadilac starter switch

I didn't know where to post this so here it is. A good Mopar friend of mine is restoring a 1927 Buick. All he needs is a starter switch. The one that you push with your foot to engage the starter. HAS TO BE FOR A 26,27,28 Buick or Cadilac. Maybe one of our members knows someone that may deal in the type items? Thanks