Hi all can anyone help me please on how to refit this piece

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You position the flap vertically and align the 4 vertical springs with the small holes in the flap and push it down onto the springs.
You then rotate the flap to the rear of the car until it is flat with the plastic tabs lining up on the long bar fitted to the car.
It’s then a case of pressing the flap down on the rear edge until the tabs locate on the bar, or in my case banging down with a fist over each plastic tab position.

Cheers mate the springs had all bent upover once I straightened them then followed your instructions went in no bother cheers mate