Ignition harness - Spark plug terminal

[Eagle-Mike]

The collar inside the coupling nut at the spark plug terminal broke yesterday at #3 lower.
Magnetos are Bendix S4LN-200 and 204

I can't find replacement parts for the spark plug terminals. Any hints for sources?

Since the harness is probably 40 years old, I consider a complete replacement as well.
Does any of you have experience with the ACS harnesses?

Thanks for your replies Mike

 

[TFF1]

 

[PittsDriver68]

 

[Eagle-Mike]

 

[will moffitt]