Refills for Metal Wipers
Refills for the pushbuttons have a rubber block on the top of the metal rib. This block sits tight between the two claws. A universal replacement will not have this, but if it has a spring clip on one tip, that works well too.
Classic Industries has a supplier making replacments for 15" and 16" ANCO blades. But they only stock 16" refills. They were looking into getting 15" refills. This same refill was used by GM etc so the market for them should be decent. They probably need more encouragement (ie contact them and ask - enough people bug 'em and they will probably follow through).