In your post #1, you said you replaced the Vlach ignition with RCexl? So you still should have the Vlach lower plug boot. The CM6 plug you mention is not standard older type 45 with magnets at 180°, These engines all had M14x1.25 plugs. To fit the CM6 plug, you either had to insert a thread reducer, or replace the cylinder with a new type.
If the cylinder has an M10 plug thread, you need to use CM6 plugs. The Vlach boot must be removed from the ignition and replaced with an RCexl boot for CM6 plugs.
If the cylinder has an M14x1.25 plug thread with tapered seat, all you need is the lower Vlach plug boot. BTW, this is the same lower boot as on ZDZ engines.

See post #3 where I explained this as well.

The ignition I sent to Mr Molina, Peru IN, (is that you?) is the only MSR-ICU ignition that works correctly with the magnets at 180°. It has the Vlach upper plug boot. No other options are sold with this specific ignition.