Hi Mike,
Just tried to email you. Is that your email address under you name.

My email is "[email protected]

Stephen

Steven,
The connector that works on the C-26 unshielded plug will work on the identical unshielded connector of the M41E. They are both unshielded and the M41E is totally interchangeable with the C-26. Trust me. Google "Champion M41E Spark Plugs" and find some pictures. You will...

Mike,
The Continental 65 in my Tcraft has C-26 spark plugs which have what I would call an automotive connector, not threaded. (tried to insert a picture but couldn't figure out how). What is an AN661 connector?
Thanks
Stephen

Stephen,
No harness change required. The M41E is an unshielded plug just like the C-26. Both use the same AN661 (?) connector. Been there and done that on my '41 DeLuxe.
Mike...

Thanks Mike. The trouble is, I would have to change the harness if I changed to the M41E. I'll see how I go but might have to change the harness.
Stephen

The C-26 is very hard to find. The modern alternate is the Champion M41E.
Mike