1+ Handle reinforcement  
2+ Waist capping  
3+ Moulding  
4+ Armrest capping  
5+ Base plate  
6+ Setscrew  
7+ Shakeproof washer  
8+ Plain washer  
9+ Moulding  
10+ Moulding clip  
11+ Casing clip  
12+ Pronged button  
13+ Snap sac fastener  

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.