SD-Series 108SD
The Freightliner SD-Series includes the 108SD, 114SD, 122SD and has been producted from 2011 to present. This is a conventational cab configuration. The SD-Series are severe-service/vocational variants of the M2 Business Class and reguire a low profile seat.
Always assess the fit of a seat to your truck, as your individual cab may be modified or require a special adaptor plate. Installation of a new truck seat is at the sole discretion of the installer.
Confirm that your truck has a curved floor such as the seat pictured below. Adaptors are available (under M2) for National, Sears, Prime and Knoedler seats. Knoedler Extreme Loowrider is the only seat with a defined stroke to limit the up and down motion and head clearance in tight cab configurations:

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            National Ensign LO Seat (choose your options)
National Seating
Your Price: $757.00 - $989.00National Ensign LO Seat for certain Medium Duty applications The Ensign low features a thinner cushion for extra lo profile application and fit into Freightliner M2, Freightliner FLN and Ford F-650 and F-750. Suspension is either air or EZ-Aire...71123Your Price: $757.00 - $989.00