I have purchased Prime-Line R 7321 Drawer Slide & Guide - Drawer Furniture Replacement Parts. I have several dressers that are 10 years old. I thought due to the age of the furniture the rails and guides would not work. To my surprise, they fit well and were easy to install. I have no problem with missing parts or wrong size parts. I looked at the serial numbers on the rail and airframe and compared them to what the website said. Note: be careful when adding them to your furniture as I slashed two new ones. I would recommend this to everyone.