You know what just came up with for NOS bottles
or even fire bottles for your custom cars. I've seen
four inch high fire fighter action figures with air
backpack air tanks for $2.50 that would just about
the right size. I've seen them at Target, Kmart, Meijer,
Walmart and Big Lots. Maybe you could give them a try!!
Kurt you could also take the bottles out of the 1:24 scale Jada cars, some of them are already labeled with Nitrous Express stickers, and the dash top guages, and wheels and disc brakes on them can be used on the 1:18 scale cars (just swap the tires from a 1:18 scale car onto the Jada rim) and look pretty good. In my area those cars sell for about $10, so its not too expensive. smile!