100Pcs Threaded Insert Rivet Nuts, 6-32 8-32 10-24 10-32 1/4-20 UNC Flat Head Rivnuts Suitable for Metal Plate, Aluminum Zinc Plated Rivet Nut Assortment Kit: Amazon.com: Industrial & Scientific
Riveter + Rivet Nuts Set for Rivets - 6.4 mm and Riveting Nuts from M4–M10 : Amazon.de: DIY & Tools
Amazon.com: Novus Threaded Inserts A6 M 4 X 10.5 Mm, 10 Nuts for Blind Rivets in Aluminium with Diameter of 6 Mm Ideal for Synthetic Material and Lightweight Building Materials, 045-0041 : Industrial & Scientific