hi, there is a very thin black rubber seal ( not sure if its the one you meant but it sure looks like the one in the pic you put up ) ) that runs all along the roof bars both sides ( inside & out) its the one that overlaps slightly onto the polycarbinate roof inside & out, but that is fixed into the bars so there is no way to remove that unless its cut out from what i can see,failing that idea what is the possibilty of my other suggestion about getting onto roof via the bars ? would they hold the weight ?, again thanks in advance...also looking at my pic of the actual roof bar end fitting..it looks to me that if i were to be able to grip and pull the end strongly enough that the top glazing bar cover could actually slide down as it looks like a "v" fitting which although cannot be lifted ..could possibly slide...is that a possibilty ?