Hi, ,
For the cloth covers, all you need to do is measure each component of yours & leave 1.5 inches extra on all sides since cloth covers may shrink a little after a wash depending on the material. Take the measurements to a person who sells curtain material. Buy preferably light fabric which will prevent dust & easy to wash. Give the cloth roll as per your measurements to a tailor who will stitch them as per the measurements.
Have attached an image of my covers. These covers really prevent a lot of dust from going in especially for the receiver. They are open from down & have no zip & have to be just put from top.
Hope this helps.