These coils are a ideal straight replacement for 4T coils, and with very little effort they can be fitted to any bik with a 2T or 3T motor. The modern windings work a lot better than the original villiers coil.
It is also perfect for energy tranfer systems where you use a source coil within the motor, and mount this external for Ht.
If at any time help is needed wiring them, we can talk you through it. Or supply a diagram.