Car and Armrest arrived. Fitted it today and am really pleased. Really simple.
1. Pop out current storage holder using fingers.
2. Unscrew 2 nuts
3. Place in supplied brace plates on bolts
4. Tighten nuts back up
5. Slide in arm rest unit.
6. Place 2 nuts on rear bolts and tighten
7. Screw side bolts into arm rest, one each side.
8. Click rear cover on armrest.