I MAY have a bag that big somewhere, but probably got rid of it. I will have to alter my kb stand too, as I think the SD7 will not fit on my 61-note stand. I do have a couple that will work though.
PA3x is 38.5 inches long, and SD7 about 46. It's not nearly as deep as the others though. PA3X76 was only 47" btw.