I would not spend $100 on pad for mass produced rifle. We are not talking Westley Richards or Holland so Pachmayr Old English should be good enough. These are very heavy rifles so no fancy goofy recoil reducing pads are needed.
I would not waste time replacing sling swivels. NECG carries Recknagel ones that should fit old Sako. I'm pretty sure when I bought Browning Safari at LGS they pulled couple off used Sako for me. These were ERA Recknagel make.