There doesn't seem to be a laundry list of know accessories for the North Korean Type-63 SKS, but on this page we will list what is known.
The North Korean sling is a pretty straight forward green canvas constructed sling that is sewn to the sliding buckle on one end, and sewn to a hook clasp on the other. Like many other slings, the clasp end loops back through the buckle when installed, and the sling has one leather 'keeper'.
Fairly standard cleaning kit we are all used to seeing. Perhaps this picture will be useful for identification and referencing purposes.