I thought this thread was dead!
Yes you are right, they are Sako 75 (or 85} swivels. I know because a Sako 85Finnlight I bought recently came with an identical set but the pins are a lot tighter fit than the ones in the picture.
I fitted a small circlip in the groove in the pin and they haven't dropped off my 75 yet. Although no clip came with the 85 (nor Allen key either) I also used a circlip on this rifle to be sure.
And, sorry no, I don't want to sell them - they look nice on the Finnlights.