One another note about the czech dub. One member named pittrek replied to my original post and send me both czech dub versions for every Harmy’s mkv file and I must say that they fits perfectly, so far I didnt noticed any desync…however that’s not the case for the dub syncs included in the actual mkvs. Some parts are so horribly out of sync that it is practically unwatchable. Especially in ROTJ (Yoda closes his mouth, then you hear him talking…i noticed that one part of Endor battle is about 2 sec desync…etc).
So i would strongly recommend to ask pittrek if he would be willing to include his dub syncs to the mkvs or in some other way made them public, because it would be shame (for czech viewers) to not include them.