different base plates on the road dragster.
http://img254.imageshack.us/img254/1307/roaddragster19sfbasejf7.jpg
different size tow slots, different angles above front wheels, different size axle covers, different size lettering and location of A, different style base plate below front wheels.
http://img254.imageshack.us/img254/5702/roaddragsterbaseadr4.jpg
different size bumpers, lettering and axel covers
http://img407.imageshack.us/img407/7629/roaddragsterbaserearpz3.jpg
different front emblem positioning
http://img489.imageshack.us/img489/4614/roaddragster19sfbase4io8.jpg