1+ Seat squab  
2+ Squab cover  
3+ Squab surround  
4+ Tunnel cover  
5+ Cushion  
6+ Cushion cover  
7+ Cushion  
8+ Stud  
9+ Cam plate  

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.