0+ (Unillustrated Parts)  
1+ Cushion cover  
2+ Cushion pad  
3+ Squab cover  
4+ Squab pad  
5+ Squab backcover  
6+ Mechanism cover  
7+ Mechanism cover  
8+ Knob  
9+ Escutcheon  
10+ Screw cover  
11+ Internal mechanism cover  

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.