Toyota still sell the rubber inserts if you know the part number. But most of their wipers use a 6.5mm claw width, I can't remember if their bigger vehicles/SUVs like the tundra, 4runner etc. use 8.5mm or 6.5mm. But if anyone here has a toyota and can confirm the model they have uses 8.5mm, I might be able to go hunting for part numbers and hopefully they're 18 inch or longer so that they can be cut down to size.
Another option are silicone wiper blades, I once bought a cheapo pair of them just to try them out, they only lasted a year but during that time, once the wipers deposited a thin layer of silicone that they usually do, I never ever had to use the wipers above 55 mph, the water just beaded right off, it was pretty great. PIAA is an expensive option but you do get what you pay for, they can last for five years or longer. From what I could find on Amazon reviews, their refills 22 inch and shorter are all 6mm, while 24 inch and longer are all 8mm - I'm pretty sure our C bodies' closest wiper claw size is the 8mm/8.5mm one, might need to use pliers to squeeze them a bit tighter. Rockauto sell the PIAA blades, but unfortunately all but one of them are <24 inch, the 24 inch one is the SKW60E.