Need main flex for Sony Xperia Z5 premium

Hi. I have problem with my Sony Xperia Z5 premium - the ON/OFF button is not working, the jack audio and the speakers too. I was told that this can not be fixed with changing the only the parts, as the problem is in the main flex that should be changed. I saw that you have this part, but for Sony Xperia Z5. Do you have the same for the premium, how much it will costs and can you ship it to Bulgaria, as I'm living here? I bought the phone from USA and i was told that is better to buy the needed part from USA, as there are some differences in the parts that are made for same phone types for Europe and USA.

Thank you!

Regards,

Yoana