you just need to make sure whatever amp brand you favor has a model with "high level" inputs. You take the existing speakers wires, run them into the high level inputs, then take the amp output & feed that to the new 6X9s.
One caution you may not of thought about (I don't know what you're running now) - unless the front speakers are also upgraded & amped, the rear set will be overpowering. The audio result is like you have your back to the stage at a concert.
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