Dyna or Accel coils will work. Check the ohm rating for your application (point, CDI, or electronic).anti-blaster said:who makes aftermarket coils for the gs1000 motor?
http://mrgasket.com/pdf/Universal Motorcycle Application Chart.pdf
http://mrgasket.com/pdf/Accel Dual Tower Coils.pdf
Go to the GSResources for more info on that engine.