To bump an old thread, BSK are using coils and plugs off a Ford Fiesta V 1.3ltr 2001-2008 I believe. I have the full setup on my K now that I got from another P/O.
The p/n for the lead set is Intermotor Ignition Lead Set 73986, the coil set is Intermotor Ignition Coil 12807.
To connect to stock K100 wiring:
Coil Pin 1 to Black/Red (coil for cyl 2+3)
Coil Pin 2 to Green/Yellow 12v
Coil Pin 3 to Black/Blue (coil for cyl 1+4)
You can also buy a ford coil connector from Aliexpress for cheap or get one from a wrecker and it should work. (Alternative is to pin the plug manually.)
The set-up just works, and I'm about to test it on my mates 85 LT also.
Bsk is nice because it comes with a bracket and you don't have to go poking about for parts, but you can do it on the cheap.