ANTIQUES ROADSHOW drives to the Gilmore Car Museum near Grand Rapids, Michigan, for a look at its collection of more than 1,500 hood ornaments or "mascots." Appraisal highlights: a letter from Grand Rapids native son, Gerald Ford, written in 1967 to his former kindergarten teacher; a pair of earrings made from cufflinks given to the guest's grandfather by Czar Nicholas of Russia; and an 1881 painting by noted Hudson River School artist Jasper Cropsey, valued at $300,000.