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For the 6 gallon water heater there is only one size.

Only the Suburban uses an anode rod. I'm assuming you have the 6 gallon water heater. These anodes are readily available on various websites. I would try eBay. Your water heater may be by a different name before Suburban purchased the company. But the square door models are Suburban types, and the rectangular door models are Attwood types. The Attwood types supposedly have aluminum tanks and don't need anode rods.