King : Premium Liner for Softside Mid Fill Waterbed King

I want tp replace the foam side supports on my softside mattress. Will this work?

Will this liner work with straight wall style softside waterbeds?

Would this be considered a waterbed frame?

What are the actual dimensions of this liner? The soft side water bed I own has interior dimensions of 65" x 69" and he 8" deep, will it fit?