extra seal found when painting rear wing

hi there,
I removed the rear wings for painting and found a rubber or sponge seal that is not mentioned in
the workshop parts manual, see picture.
I contacted Geoff at Winns and he has them in stock, so waiting for them to arrive from England, meanwhile am getting on with the painting before my window of opportunity is lost. Winter is fast approaching and the days are getting cooler, so speed is the essence.....
This is for your information just in case your decide to do the same job.


the hard rubber seal in situ, before removal with a sharp wood chisel ...