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you have 2 choices
1) obtain the correct part .. probably from the manufacturer .. only remote chance a parts supplier like mouser etc may have it
2) rearrange the connections using a different type of connector
it seems it's some specific conductor material (that may have a specific "conduction profile" crucial for the amp to function / be protected properly)
2) contact the amp provider and ask if the custom replacement can be used -- and if there's no difference then again if it's soldered to PCB from both sides you need to know exact timing and temp not to damage the PCB -- many factories do fix their stuff -- in this case it's likely cost worthy to pay the delivery there and back -- yet otherwise you should cut the remaining conductors near the PCB and desolder using the lowest possible temp for least amount of time or heat the remnants of the conductors until they "drop off" they might be tight fixed to epoxy (heating them may expansion fix them even more -- a lot of fun not to start with if you can't keep your head ice cool and acknowledge it being extremely delicate slow and frustrating process you need to pay attention a lot of stuff to manage it without damaging anything such as components falling off from PCB or burning yourself)