Pioneer 760w RCA question

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I have a dumpster find Pioneer 760w that needs new RCA inputs (the shields are missing). They are an over and under configuration four pin where the grounds are separated.

If I used a three pin set of RCA jacks where the grounds are connected internally, would this cause issues with the amp and would I need to bridge the two grounds at the board with a jumper wire or resistor or what not?

David
 

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