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Don't take this as gospel, but tony gave me his old pipe from his mkII and it fits my KZ1000A2. Its not a Kerker, in fact I don't know what it is. I did have to make a mounting bracket, but it wasn't too difficult.

all Z-1---KZ--KZ MKII--and KZ Jmodel--exhuast ports are close enoughin spacing and dia to mix and match headers,the early z's had smaller dia ex bolts and so those ealry Z-1 kerker ect headers are a tight fit over the newer z's and j models bigger exh bolts...the sweep is the same to wrap under the motor..just the mid pipe lengths change some and brackets vary in location......99 % sure

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