Remember when Ho-Ho's used to be wrapped in foil? They don't taste right in a plastic thingy.
And when KFC used to be "Kentucky Fried Chicken", with a big bucket for a sign? It's still a craving, but just doesn't taste the same

Stouffer's creamed chicken. I used to boil a bag of that and put it over rice. I don't even know how I'd find a similar recipe.
And caps-those little things we would bang with a hammer. I understand a lot of noisy/fireworky things are out of the question, but I don't remember anything dangerous about them (but then again, I was a kid)
Stuckey's restaurants-when I was a kid, and my dad drove from Ohio to Florida, it was our first Stuckey's that really said "South". Then one opened in Mansfield, Ohio

. Now I AM in the South and can't find any. I think I'd kill for fried chicken and a pecan pie now.
Howard Johnson's restaurants-they had THE BEST hot dog, wrapped in a thick piece of toast. 5 Guys dogs with relish are close, but don't have the toast.