Hate for your purists, solution for those being sensible and practical.......
1. Sunvisors......originals hard to find, or not to be found.....I made a solution for my pilothouse. Two matching sunvisors from an 87 Nissan D21 hardbody pickup fit my 51 Pilothouse B3B to my satisfaction, resolved the simple problem of originals that may no longer exist. One restriction is the mobility of swinging visor to side, but driving vision is looking forward in lieu of sideways gawking!
2. Electric wiper motors.......installed 2, one right and other left, to operate independently. Source was from the rear door of an 88 Isuzu Trooper. Drilled the cowl to the mounting pattern of the 48-50 stock wipers, where there was adequate room between body and dash. Easy to mount with glove box and speedo removed, easy to fab addition support mounts. Vehicle is pending installation of aftermarket wiring harness, all to be 12V. Aftermarket adjustable arms and blades will fit the criteria for wiping sweep to fit the glass area. The parking will be reversed to the original equipment, more like the 48-50 vacuum, but flat to the cowl.
I have access to any number of sources for parts in some of the work I do.......cost is FREE; utility of parts is according to my creative element. Just getting around to installing parts I have stockpiled. Purist pessimism can never counterbalance practicality.
For whatever the worth???