well it's not actual faceplate,
it's all the buttons in that pic
you can't just buy one button
you have to buy the set, which comes in the a dummy faceplate as in the pic, then you have to take the buttons out and put in yours
they run about $60 from crevier, 80+ from local dealer
at least you'll have all new buttons, because if one popped out that easily you know others will too
it's very common on X5 for those buttons to go bad, or break, once you get the new ones in your hand you'll realize why