For those unfamiliar with the factory documentation that supported the production of the car we all love, below is the product engineering drawing for the MK II Cooper S rear parcel shelf assembly.
A few things to look at:
1. It's an
assembly drawing so it shows how various components go together to make the final part. The part numbers of the components are shown and the type, number and position of welds is specified.
2. The part number is HYA7930. The Y in the second position of the prefix means this is an Australian part.
3. The First Used On field says YDO6, the factory code for an Australian MK II Cooper S.
4. There is reference to part HYA7167, which is the parcel shelf panel without its additions. There's a separate drawing for HYA7167 showing the dimensions and material used to make that panel.
5. The location and welding specification (1 spot weld per clip) for the fuel tank breather tube brackets (RBS0407, previously HYA1308) is shown.
6. The small centre hole referred to in an earlier post is shown, as is the oval hole and four bolt holes for a speaker on the driver's side, although its precise location is not mentioned.
7. The rear seat belt mountings are shown. I think there's a separate drawing showing how and where these are fixed.
8. The funny angled bracket that the boot lock tongue hits when you close the boot is shown (HYA7939), fixed by 5 spot welds.
Hopefully this answers more questions than it raises but please feel free to ask.

Attachment:
HYA7941 Rear Parcel Shelf Assembly small.jpg