Signed Ernie Irvan Kodak hat

This hat was Ernie’s sent to my son around 30 years ago. My mother wrote to Ernie about my son being a huge fan and he kindly sent the hat, grease spot and all. There is a signature on the bill of the hat as well. Unfortunately I can not find the letter that came with the hat to identify the signature-pit crew???? another Nascar driver????