hello guys, I want to mount in My skoda octavia 3, the leather seats from the Audi A3. Do you think that I can mount them?Or seats from VW Golf 6/7 or VW Passat? thank you so much

Not sure, have you measured the mounting points? That's where I'd start

Have a look at this

 

http://www.briskoda.net/forums/topic/398678-aks-mk3-octavia-vrs-project/?p=4652799

 

I'm sure those wing backs are Audi

Perfect, the front seats is ok. But the rear seats? my doubt is on them

Those are GTI seats. It is written on them. You can see it if you enlarge the picture.

Probably it is an easy fit from MK7 Golf (GTI, R, ...).