The Chinese used both blade & spike bayonets on their SKS. On the "paratrooper" SKS they used a short spike, not sure if they used a short blade also.
Some of the ChiCom AKMs used underfolding spike bayonets, but only short spike type. IIRC the AKM underfolder spike is different than the SKS bayo.
Check e-Bay, Gunbroker, etc. I've seen plenty of SKS blade bayonets turn up there, including Russian, Romanian & Yugo (mostly M59/66 which may or may not work...).