S1 was a Stubby Stevens # from the New Egypt area. Also Moschera drove that number also. Bob Rossell or somebody told me that it is the registration classification for a school bus or something like that and Stubby worked for the school district I think.
Let me know if you remember for sure, or if someone else can confirm it, we'll add it to the list.
As for the Mini Stock, in this trivia challenge, we're keeping with just listing Modifieds and Sportsman. Gets too crazy if we start listing mini's, midgets, sprints, etc.