Finding a belly tank in the '40s and '50s was very, very easy ... and they're a major part of hot rod culture. So where does that strange-looking "bodywork" come from? The short answer?

The hot rod culture is vibrant today ... There is no charge for the postmark up to a quantity of 50. For more than 50, there is a 5-cent charge per postmark. All orders must be postmarked by ...

These tiny metal capsules with wheels are called belly tanks, or lakesters, and they're a major part of hot rod culture ... a belly tank in the '40s and '50s was very, very easy.