Hard wearing vacuum formed cushions. Seat bottom measures 15.5" x 12" (W x H) / Backrest measures 9.5" x 8.5" (W x H). It is 20" from bottom of the mount plate to the top of the backrest cushion. The seat will fold up to a width of 5". Seat Belt 51806 & mount brackets 59915 sold separately (See related Products). Replaces AL173569, AL114321 A-STJ10.