We have a Model 43 blade on our 110, but it looks a bit different than Knucklebuster's. One thing I notice, is his doesn't seem to have the same lock that prevents the trip springs. Ours is on the top, his appears to be on the side. Hmmm?
Here are some pics of our 43 blade. Now, what you need to understand, is ours is mounted on our '66 110 Round Fender. The early Round Fenders took a Model 42 blade. The 43 blade was designed for later Square Fender 110s (and other models). So our 43 blade attaches to the Round Fender with a special adapter bracket.
Also, the 43 blade is only 42 inches wide.