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If they are beater test speakers (if not you probably should get something else to do testing with) then any matching pair of 8ohm woofers that fit should do.
By the way if you don't trust an amp or don't need to hear it for a test keep an eye out for 4-8ohm power resistors rated around 10-50W.... speakers are usually assumed to be a resistive load in design practice, and all amps should be happy to drive a resistor of the same rating as a speaker.
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