I had this done by the premier Yamaha tuner in the country, Don Plowman:
I believe it's a bazooka. The extra lead off the speaker is for connecting to an amp. 
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Chino 1960's to 1976, Torrance, CA 1976-1983, 87-91, 94-98 / Frederick Co., MD 1983-1987/ Valencia, CA 1991-1994/ Brea, CA 1998-2002/ Dana Point, CA 2002-2019/ Knoxville, TN 2019-Current/ FL 2022-Current
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