Universal Forward Stabilizers have universal spacing sleeves that can be added or removed to accommodate a secure fit with Sentra EC 20", Sentra HD 20", Sentra Reclining, Cruiser III, Cirrus IV, Viper, Viper Plus GT, Viper Plus Reclining and most other leading manufacturers wheelchairs. Can accommodate a secure fit with Sentra EC 20", Sentra HD 20", Sentra Reclining|Can accommodate a secure fit with Cruiser III, Cirrus IV|Can accommodate a secure fit with Viper, Viper Plus GT, Viper Plus Reclining and most other leading manufacturers wheelchairs.|Easy to install