need speakers for IS-67/69

I would like to find replacment speakers for my door intercom. the main unit is IMA 516 the speaker specs are; 16 ohm, 1 watt, 3-3/8" sq. 4" on center bolt holes. I need 2 for outdoor use, the ones that I have lasted 30 years and one was an indoor speaker (the cone is ripped to shreds and still works)the other one is a weather resistant cone in good shape but no continuity. I hate to spend $70+ for for two replacments when the speakers are like a $5-$10 item.

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