AK build question

[Blwnbwtie]

I have this yugo parts kit and a vulcan lower that i have had around for a while and finally got the ambition to start working on. I have a few questions. On the rear trunion the top rivet isnt just a regular rivet, can i just use a regular one in its place or do i need something different. Also the trunion has 3 rivets in the back where the vulcan receiver only has 1. Should i drill 2 more holes or is 1 rivet enough to hold it in place. The trunion is also held in on the bottom by the trigger guard. Here are some pics, any help would be appreciated.

[Blwnbwtie]

got the top one out, it wasnt a rivet it was a screw of some sort. what about those bottom two are they necessary?

[JeffM]

got the top one out, it wasnt a rivet it was a screw of some sort. what about those bottom two are they necessary?

yes

[JHC]

That screw assembly up top is the retaining pin for the recoil spring assembly, it is a special Yugo only thing that was designed to keep the top cover from popping off when launching grenades.

[motorhead]

photo not good, you do have a yugo reciever, right?

[Blwnbwtie]

It is supposed to be a yugo receiver, i bought it right when this whole OLL thing started at gunrunners and they told me to get a yugo parts kit. Everything else seems to line up okay except for those two holes for the rivets in the rear, drilling them out shouldnt be a big deal. I was just wondering if they were necesarry since its already held in at two places and most other AKs i have seen only had 2 rivets for the rear.

[motorhead]

yes. the yugo stock mounts completely different from other akms. totally different rear trunnion and rivets.