My 2010 E70 X5 has "trunk tension straps" on each side of the cargo area. They are stretched out, and I have obtained the new straps (part no.51477140694). I'm not anxious to pay the dealer to install them, but can't find anything online about how to replace them, and don't want to start prying out the old ones if I don't know what I am doing? Has anyone replaced those straps, and can you tell me how to replace them? Thank you very much.