You can order it from the dealer. The other option is to order them pre-cut from SeaDek or order blank foam from SeaDek and cut it to shape yourself. The SeaDek stuff seems to last longer w/o cracking and stick better than the factory stuff. Or, at least the factory stuff that came on my '05 trailer.
2005 ProStar 197TT, #28 of 100
Broken Bow, OK vacation cabin for rent -