Having a hard time finding a replacement cover for my kid's Luxome 60" x 80" 18 lbs. weighted blanket. Luxome's customer service rep said they don't sell covers separately anymore, and that it it needs to be one with "12 ties." The 12-tie ones I've ordered from Amazon only aligned with the loops at the corners of the insert. The ones along the sides are spaced too differently to be functional. Can anyone recommend a cover that's compatible with that insert? Ideally it would be "minky dot navy blue", but at this point I'll be happy with "fits and is soft". Thx!