If I remember correctly, seat belts were available as optional equipment in some American cars going back to the 50s, maybe further. My dad's 63 Corvette had them, and so did the 64 Impala and 66 Chevelle.
You can still buy candy cigarettes, and a lot of other cool candy stuff, at www.nostalgiccandy.com
Oh, yeah. Almost forgot Space Food Sticks. I loved those things. www.spacefoodsticks.com