The Norwegians made up new slings for these rifles as well. I've seen them with garishly varnished stocks and just BLO finishes. I saw a batch that came into Lever Arms, that was everything from pristine to beat to hell. Mostly they have the laminated stocks, with flat butt plate. Some had the cupped butt plate as well. Must have come in late in the war. Not all but most of them had machined fittings. It's very hard to say. Because of their origin and what they went through during refurb, anything is possible.
That's the thing about milsurps, most of them were built under uncertain conditions and even though the factories and refurb depots tried hard to stick to standard, there were a lot of occasions where they just made do with what they had on hand. In real life, no one noticed until 40 years later and tried to establish a stringent correctness guideline. Go onto Milsurps.com and read som of the REME's statements and even Peter Laidlers comments for a rude awakening on what was done to keep a rifle battleworthy. Look at what the Pakistanis, Indians, Turks and all sorts of third world countries do to keep these old warbirds functioning. It's not always pretty, but it is still correct. IMHO. Oftentimes more interesting as well.
The Norwegians were desperate for modern firearms in the late fourties and early fifties. I have no idea how many Kar98K rifles were converted. I'm sure there were figures kept. I do know, not that many made it to North America. When they did get here, they weren't cheap, in comparison to their 8x57 brethern. You could pick up new mausers in the crate, with all accessories and consecutive numbers for less than $200 for the whole crate, shipped to your local bus station. A Norwegian, ran $60 for a rifle, without accessories. I am a bit reticent about many of the accessories as well, a lot of the rifles I saw, had the German stuff thrown on with all of the original markings, nothing to indicate the bayo or sling were Norwegian.
The rifles Lever brought in, only had enough slings, bayos and cleaning kits for about a third of the rifles. He sold them separately as they were just normal German kit and none of it matched any of the rifles in the shipment, other than it fit onto them.