Thank You for all the answers.
Nikon Poland was first place I've checked. They don't have any parts for F5. They will stop F5 service/support next month.
Nikon USA has fantastic offer:
I don't know if it is still actual. They simply answered me, we don't sell to Europe.
I don't know eBay. Never had account there. Maybe I'll have to create one.
Ali Express? I've checked Ali, I didn't find anything. Must have used wrong words. I've never been fan of their search engine. And sometimes what you get from China is a copy, not real thing (ask me how I learned that). Sure some copies are very good and even better.
Takkun, thank you for your offer. I usually try not to bother people with my problems. But if Nikon USA offer is actual, it's real bargain. Compared to other sources. Too good to be true.
BTW, Amazon price for front panel is 99 USD, wow....