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Western Pottery is an obscure brand. Chances are slim to none you'll find a replacement but is the tank cracked? where is is leaking from?
Ok then you can probably use a generic tank to bowl repair kit.http://www.homedepot.com/p/Fluidmaster-Tank-to-Bowl-Kit-15-Piece-10460X/202930566
You have to remove the tank then the donut gasket replaces the one on the threads on the flush valve where it sticks out of the bottom of the tank. Also replace the tank bolts putting a rubber washer under the head of the bolt before inserting it into the hole(s) in the bottom of the tank.