I use 16" blades and wiper arms from a '71 Jaguar XK. They are about $15.00 each, have adjustments for arm length, adapters for different type of blades and the blade position can be rotated on end of the arm. They slip over the splined wiper shafts with no problems and adjustments can be made with the blades on the car for more precise coverage/parking. Pretty handy.
Mine are: NAPA 60-751 Adjustable Wiper Arm. They come in silver (steel), so I painted mine black. I bought them over the internet.
Rodger Petre (Bakersfield, CA)
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