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Do you have model on heater and have you tried poolcenter.com?
The only two places I am familiar with who sell parts for the heaters is poolcenter.com and poolandspa.com
Many of these are obsolete but if you can contact them they can probably recommend a replacement part.Let e know.
I do not have the model on your heater to verify.If you can call, they can verify. Take a look and see if this looks like your old one.