Hans, too late, they are already dented.
My top is very tight. I still can not close it from back to front. I have to lock the front first and then slam the rear. I have left the top up for the last three months hoping it would stretch. It is better, maybe another three months.
Edit: I can not find the rubber bumpers in the epc or on any manufacturers web sight. Is it just a peice of rectangular hard rubber?
Edit again. I got it to close.mthenare a couple good videos on utube. I forgot to close the two lowere first.