Bingo. I wouldn't worry about the piston or carrier either though.
I'd personally keep a spare set of every spring (don't forget the disconnector), a firing pin (retainer because hey, we all loose things), extractor, and that's it.
My United States Rifle, Caliber .30, M1 shoots a much more potent cartridge than the Saiga 5.45x39, uses 2 locking lugs, and is a long stroke piston operated rifle. A set of springs and she's shooting like new. Not bad for a rifle made in 1955