The first Model IV had the factory designed mount with the Stainless Steel stand-offs. The talk then was of the individual wires exiting the modules having a tendency to break with engine vibration. I compensated for that by making a U shaped piece of sheet aluminum and riveting a channel to that that I could then bind the exiting wires too. No problems in 900 hours - except a broken SS support arm. Replaced it with 4130 steel.

N96KL Ignition Module 1.jpg
N96KL Ignition Module 2.jpg

The second IV had the modules mounted to the stationary section of the engine mount, but I still put a support structure to keep the wires exiting the modules from vibrating.

N338S Ignition Module 1.jpg
N338S Ignition Module 2.jpg