Springfield Plug - in Accessories. Made of corrosion-resistant aluminum. The Hi-Lo system allows you to sit in the full upright, or "Hi", position while fishing or down in the "Lo" position when the boat is moving. Select yours and order today! AVAILABLE SEPARATELY: Springfield Plug-In Hi-Lo Swivel Only; Springfield Plug-In Hi-Lo Base / Post / Seat Swivel 2 3/8x9" Lund; Springfield Plug-In Hi-Lo Base / Post / Seat Swivel 2 3/8x12" Alumacraft; Springfield Plug-In Hi-Lo Round Satin Base Only; Springfield Plug-In Hi-Lo 9" Post Only, Lund OEM - word search in our store for "Springfield". Springfield Plug-In Hi-Lo 12" Post Only, Alumacraft OEM