Sako sling swivels - you can use a pair of pliers and pull the loop off of it. It will then fit any detachable you use.
In reference to the pad - the ones that are being sold by Custom Shop are from the Sako factory (not sure who actually makes them). These are current production and do not crush (or at least the ones that I have are not showing any signs of crushing in the last 1.5 years of using them). You can save yourself a few dollars and order them directly from Brownells. I think they want $98 each for them. My local gunsmith charged me $35 to remove the old one, install and grind to fit the stock. Make sure who ever you take it to can grind the pad on the stock. You do not want those goofy holes in the pad.
I saw the pads at Custom Shop and thought they were expensive and looked a bit rough in the pictures. I didn't realize they were still making them. I searched Brownells and cannot find them, what is the item description to search for on their site?
Thanks,
MJS
