Brodart10 pack 12" x 26" Just-A-Fold III Archival Book Covers - adjustable, clear mylar

I have a oversized Omnibus edition book. The total dimensions of the open dust jacket are 11" X 25" will this pack be suitable for my needs?

I want to cover the century book measurements 28 12/16" long and 10 10/16" high what size brodart should i get?

Would this size work for me, my book with dust jacket is 10 1/4 high and 12 1/2 from spine to edge.

My dustjacket is 8.5 inches tall and 21 inches wide. Would this be the right Brodart mylar sleeve for me?