Windshield wiper refills for 64 Barracuda?

Well, it looks like Trico still makes the 43-130, but I can't find it anywhere. I think I"m going to pop off the Anco blades and store them until I can find a replacement refill for them. This may be a stupid question, but how to I take these red dot blades off? I'm not sure if they are pressure fitted onto the arm or if there's a trick. I don't want to damage either the arm or the blades trying to force them off. Any tips?

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