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Just order the Hyper Flash harness from Sharp Light or Vette Lights and be done with it. Also, did you get resistors with your LED markers? If NO, you should get them as well.
Could you explain more about this "plug in flasher"....
Last week I installed new corner lights from Vette Lights along with a hyper flash harness, so I am all good. I have a pair of load resistors that came with the Vette Lights that I am not going to use. If the OP wants them, they are yours for the cost of shipping...$10.20 for USPS Priority Mail.