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You need a Wein safe sync unless you are very very sure than the trigger voltage of the flash heads is below 6V. Alternatively you could always use an infra red wireless trigger, but again what ever you use to receive has to be able to handle the trigger voltage.
Be very careful of the cheap hotshoe - PC socket adaptors on Ebay as they are a straight through connection and too much voltage will damage the flash board in the camera. With extreme voltages it's possible to destroy the camera completely.
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