I'm pretty sure they sell just the upper handguard with Weaver / picatinny style mounts. I know they do for the SKS. They also sell a rear "receiver cover" replacement that has the same mounts on it, as well as a view-through so you can still use the iron sights. I like that, because the Yugo SKS has flip-up night sights (white dots) front and rear. And I'm looking at a holographic HUD sight on sale at Midway for 50 bucks .............. Not sure if it will fit on the rail system I bought. If not, they have one for 200 bucks that I know will fit .............
I never much cared for the Dragonov style stocks either, and I actually went with a full length rifle stock for the SKS. The Yugo has the integrated grenade launcher, so its longer than the carbine length of the standard SKS. I ordered a bipod that uses the bayonet lug for its mounting point, rather than shave off the lug and buy a bipod that clamps to the barrel, and I ordered a muzzle brake from Tapco that looks like the original grenade launcher. Without the muzzle brake, shooting from a bench and using a bipod, the gun shoots in a 4 inch circle at 100 yards using Wolf mil-spec ammo. I'm hoping the muzzle brake will help me close that up a bit.