If it's not something that's carried as open stock at sears, napa, advance, call the customer service number listed on the www.gearwrench.com warranty page, they may mail you one or have you go to Fastenal if you're unlucky.
I swapped a 13mm ratcheting wrench at Advance, but the counter guy had no idea they swapped them out. He had to ask one of the other guys, and they swapped it right out.