There is no "Civilian M37". THey were all made for the military.
I posted wiring diagrams in response to your comment in another thread.
Not sure what you mean by "civilian coil". If your truck was converted to a civilian 12 V distributor, I can't help you on finding a coil for that, but it should be relatively easy, since it does not have to fit inside the stock military distributor case.
If you are still running the stock 24V system with the military waterproof distributor and coil housing, you can get aftermarket replacement coils from Debella Jeep Parts. This link takes you to their M37 page.
https://www.debellajeepparts.com/M37catalog2.htm
I've got about 8000 miles on one of their coils in my truck, and it's working fine. The chrome aftermarket chinese coils have had significant quality issues.
