I'm replacing the window channel on my 1939 JD. Not much of the original left to know what to look for. It appears that originally there were two fairly ridged channels on both sides of the window. Across the top, (now missing) I'm guessing there was another piece of channel. I purchased a "Repops" feltkit. It included the two ridge channels just like original. However, for across the top of the window, instead of window channel they provided foam strips that look suspiciously like the original door weather strip for a 47-53. Am I correct in assuming this should be a piece of window channel or do they actually know their business.