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Automatic wipers work by sensing rain on the windshield (duh!). One method is to shoot a (weak) infrared beam out the windshield and see how much gets reflected back. The rain will reflect it back, so that triggers the wipers once a certain amount of the beam "bounces back" - this all based on the sensitivity you set.
All the cars I have seen with this feature have a "pod" glued to the windshield where the mechanism sits. I guess you could find a junk car that has this feature and reuse the pod, but I don't know on any given car where all the electronics sits - it may not be just one convenient module.
Given that for most classic cars don't see too much rain, I doubt this is available aftermarket, but you never know...