but on the other hand "which accomodates all AK-specific optics/accessories" - asm sorry about not using a quote box its not showing up
I am sorry if I am being an ass right now, but seriaously: Learn to read.
The quoted sentence goes like this
There is an integrated scope rail on the receiver which accomodates all AK-specific optics/accessories
Please try to read and understand the whole sentence.
And about the parts:
Yes, they WILL fit, once you do some milling, drilling and sanding. Out of the box they are NOT compatible.
The reason for this is the fact, that the AKSU sight has no gas tube stump on the back, while the 105 version has this. So the SU front sight has to be positioned more backward. The only problem with this is the fact, that the outer barrel gets thicker just behind the gas block, so the front sight can not go back enough.
It is a major modification, as you will need to cut, mill, drill sand and refinish the outer barrel. Not to mention the fact, that you will have to cut new threads into the end, as on these AK-s the threads are part of the outer barrel and not the sight. It is not worth the effort IMHO, especially if you need to pay someone huge bucks to do it.