1+ Oil sump body  
2+ Hexagonal head flanged bolt  
3+ Engine oil sump pan  
4+ .Drain plug  
6+ Dowel  
7+ Sump pan gasket  
8+ Windage tray  
9+ Screw  
10+ Engine oil dipstick  
11+ Engine dipstick tube  
12+ O-ring  
13+ Hexagonal flange nut  
14+ Oil pressure switch  
15+ Sealing washer  
16+ Access plug  
17+ Bolt and washer  
18+ Engine oil sump pan  
19+ .Sump pan gasket  
20+ .Drain plug  

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.