Just look at it. The outside flange where the locking cap fits is fine but the rest is in serious decline. Its badly rusted on the top and front edge of the metal fixing surface. This is where the muck thrown up by the rear wheels builds up and traps the moisture in especially as the gasket is actually dense foam !
Be warned !! Yours will rust away too if it is not totally sealed into the rear wing from the inside. I have already done this sealing with my GTi's new pipe when it failed dramatically after the monsoon at Monaco during the Challenge..
