Baby Backs here are pork, so are spare ribs. I know different parts of the country have different names for cuts of meat. I prefer Baby Backs to spare ribs as they are meatier and well trimmed. The original recipe called for spare ribs sorry for the confusion. For instance tri-tip is a very popular Que cut here in California, but then I learned it isn't even available under that name elsewhere. Hangar Steak is another yummy cut we can get. Flap meat/steak is popular in Asian and Hispanic markets here as well. It is similiar to flank steak or skirt steak.