Available in money saving 2 pack, search on Amazon for: B00079FVMG. Works With: 100 Series Gliding Door, 200 Series Narroline Gliding, 200 Series Perma-Shield Gliding, 400 Series Frenchwood Gliding Door. Replaces 200 Series and 400 Series tandem roller part number 1273704 manufactured from 1968 to 1982. Use on 100 Series gliding doors manufactured from March 15, 2010 to present.