I bought the standard size. I think the jumbos will be more than you need. The standard size is just a bit larger than the inside of the top. It leaves me a small section folded in which I leave on the side closest to the center bar. I use this to grip and take the shades out. I put in the outer corners first, then the inner ones. This leaves just a small excess which I tuck over. It looks neat inside and out.