Ok, this is probably a goofy question, but here it goes....I've seen pictures of vintage cars with and without them. Some with front center caps, but the rears not there. I personally like the raw look without, but....I'm probably wierd.
Did all of the cars come with them on all fours and some/all got lost on the track, or??? Ron (computerworks) probably has this kind of information just floating in all that extra brain matter of his.
Told you it was a goofy question.