I also have the original owners manual in my glove box, just didn't think of checking it. The C44S was the plug listed in the Motors repair manual for the E model so looks we are narrowing it down.
During my searching ran across a great site for cross referencing sparks plugs, has cross to everyone and explains what all the numbers and letters mean.
http://www.sparkplugdepot.com/cross
thanks guys,
gg