Chicago--Industrial supply giant W.W. Grainger announced Saturday that it will continue its sponsorship of racecar driver Greg Biffle as he moves up from The Busch Series to the Winston Cup Series in 2003. Grainger also announced a new marketing program around Biffle's step up: a sweepstakes promotion that will let Grainger customers choose the design for Biffle's No. 16 Winston Cup car from among three different visual concepts. Customers registered on Grainger's Web site will be able to cast their votes online. The winning company's logo will appear on Biffle's No. 16 car for one race. Biffle and the Grainger-Roush Racing team also will make a guest appearance at the winner's facility. The promotion will run from Aug. 1 to Aug. 31, 2002. Grainger began its relationship with Biffle and Roush Racing in 1998 in the NASCAR Craftsman Truck Series.