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Looking for a regulator fir my z1300 A1

I would highly recommend not replacing the original regulator with a conventional "shunt" type replacement.  I have been through 5 aftermarket stators with aftermarket regulators and would recommend you fit a Shindengen SH775 series type regulator if at all possible - see  www.kz1300.com/index.php/forum/welcome-n...r-with-1979-z1300-a1 for details. It might save a good deal of time and expense in failed stators and a more reliable A1.  Later models introduced a more robust electrical system with positive stator cooling.