Sportster Mnl Gk100H. The RECARO Sportster GK100H Seat is a great cost-to-performance version of the very popular Sportster line-up. These seats such combine includes Dial Type Stepless Recliner, Seat Heater and Pad Insert Type Lumbar Support. Dial Type Stepless Recliner Seat Heater Pad Insert Type Lumbar Support Left & Right side determines the side of the seat header switch