Hello I also have had this problem I am viewing the forum on Google translate I'm English
My Picasso C4 developed cracks on the left and right side I had a months warrantee left on the 3 year body and paint warentee given in south africa my claim was approved and covered by Citroen 100% a new trunk lid was fitted, it came back with the black seal no 4 fitted but it kept coming off, after re attaching it twice, I removed it as it seems like the spacing on the new trunk lid is smaller than the old one, I contacted Citroen yesterday and queried this and asked if the seal is available and I was told it had been discontinued and is no longer available, I was happy with citroens assistance it was approved with no questions asked considering they have withdrawn from south africa and no longer sell new cars here even though the dealers are now combined Citroen /Peugeot and they do servicing and warentee
http://citrotemp.cricou.net/upload/image/img_20180614_063509-1529142285.jpg
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If my message seems funny, I'm not retarded it's the conversion from English to French