0+ (Unillustrated Parts)  
1+ Seat frame  
2+ Mounting bracket  
3+ Intermediate trim arm  
4+ Foam support panel  
5+ Cushion suspension spring  
6+ Spring  
7+ Squab suspension spring  
8+ Spring nut  
9+ Screw  

The part numbers in the assembly image below relate to the product number in the table. Clicking on the part number will open up the relevant part details.