About the only modern option for a drop in electric is Newport Engineering's kit
newportwipers.com/product-category/cars/packard/ but the motor is 12v. To use their setup on 6v will require an additional power inverter which is offered separately in their accessories section.
newportwipers.com/product/6-to-12-volt-power-inverter/ Have you considered sending your vacuum motor to Ficken Wiper Service
rebuildingtricowipers.com and having it rebuilt. Many have done that instead and it will cost considerably less than the electric conversion. A rebuilt vacuum motor will work as new providing the rest of the vacuum & plumbing setup is in good condition.
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