Searching for Loewen casement window weather stripping

This is a tricky one. I can tell you right off the bat that we don't sell a good match for this, but we may have an alternative. 

Start by looking at our 58-053. You'll note that the kerf is a similar style, so it should install the same exact way. The issue is the size of the seal itself; our 58-053 has a much smaller bubble than your wide flap. 

Either way, it is the only thing we sell currently that would have a hope of replacing this. Look it over and see what you think.

Profile drawing of the 58-053 bubble seal.