Hey guys: Trying to help a friend out. He picked up a set of Firestone 500 boys and girls bikes. The boys is that kind of gold color and the girls aqua color. The serial number on the boys is: T 3822** I left off the last two in case he did not want the whole number published Girls: U 4231** I don't have pics but the bikes say Firestone 500 on the chainguard and have crossed flags on it too. Any help with info on years and who made them would be great! Were these sold at Firestone stores? Thanks!