merely-arrived IRobot 500 series replacement brushes

Set of 2 new replacement brushes for IRobot Roomba vacuum. I bought these thinking they would fit my 770 series but they are not the same on ends. This will fit 500 series machines as listed below. Features:1.Easy Install Keep your iRobot Roomba operating at peak performance2. Excellent quality accessories for iRobot Roomba Cleaner3. Compatible with: iRobot Roomba 500 Series Vacuum Cleaning Robots for 510, 530, 532, 535, 540, 550, 560, 562, 570, 580, ideal for everyday use. top-grade materials and excellent craftsmanship ensure long-lasting durability.