1, Adjustable backrest 8 degrees 

2, Fore and Aft sliderail with adjustment of 150mm 

3, Easily replaceable cushion 

4, Mechanical suspension integrated in backrest 

5, Popular mounting size:    

side to side x front to back 

(228--230mm)x(280--290mm) 
or   
(328--330mm)x(280--290mm)