3 measurements are all you need to make your own custom sewing machine cover. And you get them from your own machine.
Fabric http://ttfabrics.com/fabric/vintage-dressmaking-2/ and http://ttfabrics.com/fabric/sewing-chalk-words-2/
Foam by Fairfield https://www.fairfieldworld.com/store/category/support-soft-foam-stabilizer-19-x-8-yard-roll/
Bernina sewing machine http://www.bernina.com/en-CA/Products-CA/BERNINA-products/Sewing-Quilting-and-Embroidery/BERNINA-7-Series/BERNINA-790