Tue May 18, 2004 10:33 pm
MA139 is an older version of the part. MC139 is the latest version I know of. Note that the MA139 has the older IHC logo cast into it. Either will work on the knife for a Cub mower. Your top one is bent. The middle one looks like it has been run with loose rivets.
The double or triple sections at the end weren't even on the early mowers. They can be used or not, are helpful in some mowing conditions.