Arby's, which sponsors Nascar racer Matt Kenseth's No. 17 Ford Fusion, is offering free curly fries to customers on every Monday after Kenseth wins a race. Customers will need to bring in a printed copy of official race results to cash in on "Matt's Monday" and get their free order. The car made its debut Saturday. Arby's will also appear as the primary sponsor on Kenseth's Nextel Cup Ford Fusion in the Spring 2007 race.