Back in the day, you could just buy the rubber blade refills but no more.
Keeping in mind that my car is still my daily driver, what I do is I buy something like a 16" wiper out there that has the same rubber part as mine, something like TRICO 161. I then simply scavenge the rubber part, install that in my original wiper and discard the bracket. It's a waste of a bracket/frame but our cars have hidden wippers with a specific design that aren't easily retrofitted.