Wiper Arm Springs

Not serviced as separate components, and never were. You might find generic springs you could use. They need to be very strong. You'll also find clip-on external "helper" springs that look schlock and don't work and fall off.

Better: Get two Anco #4103 universal replacement wiper arms. They're fully adjustable for correct length and blade angle, and are really well made. They also come with nicely-designed adaptors to fit on the pre-1965 screw-down wiper shafts. I had worried they'd be ugly, but really, they look just fine on my '64 and work well.