The one thing I don't like on the AK is the bolt not staying open on the last round.  I am buyying an SKS-M and want to know if that will be an issue - also AIM has some AK mags:

Romainian
ProMag
Tapco

Do any or all these hold open on the SKS-M?

I saw the handy sticky on making a bolt hold open for the AK and can do that if i need to on the SKS - I just need to know what's the situation with the rifle I am buying.

Thanks in advance.

I believe the yugo mags are bho

The bho is eliminated on SKSs that use AK magazines because there is no way to operate it. IIRC some of them had a manually operated bho )(like an M1 carbine) added to the carrier.
The Yugoslavian magazines will hold the bolt open until the magazine is removed.

Thanks for all the replies - the deal fell through as I was just to hard to deal with