According to Otter it is the 200045 Magnum Kit, but that just seems short to me.
#200048 Small Ultra-Wide Kit (Fits Small UW Pro Sled | Fits Pro Cottage Pkg): 39″ L x 1.12″ W x .62″ Thick
#200049 Small Ultra-Wide Kit (Fits XT Cottage Pkg Only): 37.5″ L x 1.12″ W x .62 Thick
#200042 Small Kit (Fits Small Pro Sled Only) : 38″ L x 1.12″ W x .62″ Thick
#200043 Medium Kit (Fits Medium Pro & XT Sleds | Fits Pro and XT Cabin Pkgs): 46″ L x 1.12″ W x .62″ Thick
#200045 Magnum Kit (Fits Magnum Pro & XT Sleds | Fits Pro and XT Lodge Pkgs) :55″ L x 1.12″ W x .62″ Thick
#200047 Large Kit (Fits Large Pro and XT Sleds | Fits Pro and XT Resort Pkgs): 63″ L x 1.12″ W x .62″ Thick
