Power Button little piece missing

Hi, I repaired a HTC One XL Display for a friend. The Problem is a little piece, to push the Power Button is missing now. It is not the plastic button itself, just the piece that gives the impulse to the platine.

This is what i mean http://m.ebay.de/itm/121505332126?nav=SE...

Can I order this one or do I have to change the whole flex cable?

Thank you in advance.