I got a set sent to me by a friend before realizing that was illegal (oops!). Everything turned out fine in the end.
Just a small word of warning to any SKS owners looking to use them:
As far as the Marstar chinese surplus SKS (edit: all of them apparently) is concerned you have to grind off the rear pin to install the sights, which makes it take about 5 times longer to disassemble your rifle afterwards! Not a deal breaker, but a big bonus of the SKS is breaking it down in under a minute with no tools after shooting corrosive surplus all day.