Thanks for the reply. I resorted to looking through the original paperwork received with the camper (thanks Den2) and found the installation instructions. Simply
remove the 3 long bolts and carefully lift straight up. Place 2 2 x 4s at each end, clean both surfaces apply the seal
and re-install. These are INSTALL instructions and only says "vinyl seal" and it will compress about a 1/2". Now that's my quandary! Guess I'll have to look see and decide then about the seal to use. Maybe contact the company and get a direct replacement.
I'll let you know what I find.
Tree