For us old timers, blade refills are becoming a thing of the past. Most manufacturers have stopped producing just the blade refills. They've gone to complete heads as replacements. Most heads have blades that are molded into the head, no way to replace just the blade.
You now need to buy the complete wiper head.
Unfortunately the material used for wiper blades now days is lousy. The blades barely last a year.
You can still find blade refills but you'll need to search for them. I've given up and just buy the replacement heads.