Dorman Products ( DORM) produces original equipment dealer replacement parts for automobiles. One lingering result of the financial crisis is that the age of the existing fleet of cars in the U.S. is at a record high 10.8 years. As a result, consumers and even commercial operators of automobiles have been spending more money repairing their existing vehicles. The company is expected to increase earnings by 16% in 2011 and 14% in 2012. The stock sells at 13 times forward earnings, a discount to its growth rate. Short-sellers think the stock will break down alongside the road and have shorted about 5% of outstanding shares with a short ratio of about 13. Dorman Products might not be a sleek high growth sports car but it is cheap by the numbers and it too heavily shorted. To see these stocks in action, check out the 5 Small-Cap Growth Stocks With High Short Interest portfolio. -- Written by Scott Rothbort in Millburn, N.J.