1+ Oil pump  
2+ .Oil relief valve plug  
3+ .Oil relief valve spring  
4+ .Support mandrel  
5+ .Oil relief valve plunger  
6+ Washer faced bolt  
7+ Dowel  
8+ Oil pump chain  
9+ Oil pump sprocket  
10+ Shim  
11+ Tab washer  
12+ Setscrew  
13+ Chain tensioner blade  
14+ Washer faced bolt  
15+ Oil pipe  
16+ Oil pipe O-ring  
17+ Oil pipe carrier  
18+ Washer faced bolt  
19+ Washer faced bolt  
20+ Oil suction pipe  
21+ Flange head 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.