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Under the hood, there are 4 plastic rivets as in this picture. All of them are broken.
Where can I buy them? or can I get them from local hardware shop?
kayas, your local auto parts store should have a rack near the ones with all the fasteners that will have something that will work. Probably won't have the "X" on the top, but they will have ones that will have a center post that you can lift up on that will release then. They come in a few different sizes, so, make sure you get the correct size. Otherwise, they won't hold. If you find some made for Ford, those will probably be the ones that you are going to want.
The OP's Personal Profile shows that he's in Thailand, so the above advice isn't very helpful. If a Jaguar dealer isn't nearby, I suggest that he remove one of the fasteners and check with his local auto parts stores or Ford dealers and try to find one that matches.
Alternatively, order that part by mail from a Jaguar dealer. I think the part number is C2Z9051, but I'm not certain.