Richard Petty has been around cars all of his life. He's a true legend and larger than life. I have no idea how the #43 relates, but I'll say it is for Jack Billingham. Petty loses points for wearing a jersey over a regular shirt, but he gains points for that hat. It all makles for an interesting Celebrity Jersey Card.
Not quite on Petty's level, Bobby Labonte is also a legend in auto racing. He's only been racing some sort of cars for about 47 years though. A native of Texas, I am assuming his Celebrity Jersey Card photo comes from some promotional event at some race in Cincinnati.