This was posted by "toodeep" in response to the same question in another thread.
"The 2 seat model has them on each side but the 4 seat model just has the one. I'm not sure why that is but that is the way they come. Quote form Honda on it "Due to differences in air flow between the two models, the "M4" utilizes only a right rubber dust seal, while the "M2" has both right and left dust seals."
"The 2 seat model has them on each side but the 4 seat model just has the one. I'm not sure why that is but that is the way they come. Quote form Honda on it "Due to differences in air flow between the two models, the "M4" utilizes only a right rubber dust seal, while the "M2" has both right and left dust seals."