Make your Own Lampshade - 30cm Diameter DIY Lampshade Making Kit by Needcraft | eBay
FenchelShades.com Lampshade 6.5" Top Diameter x 15" Bottom Diameter x 11" Slant Height with Washer (Spider) Attachment for Lamps with a Harp (Cream) - - Amazon.com
FenchelShades.com Lampshade 6" Top Diameter x 22" Bottom Diameter x 14" Slant Height with Washer (Spider) Attachment for Lamps with a Harp (Linen Cream) - - Amazon.com
What size should my lampshade be? Our helpful guide to the perfect dim – 3Chooks Lampshades
How to measure for a lampshade - The Lampshade Workshop
Lamp Shade Shape & Size — Feature-Lighting.co.uk
The red ball on a beach drum lampshade, Diameter 45cm (18")