When did this option first become available, in 1951? I've only heard of second series cars with this option...
I like vacuum wipers, when there is a fair bit of vacuum, to work with. Even when there isn't, like on my drive home from Sydney Nova Scotia back to Malpeque Prince Edward Island during an out-of-the-blue-and-very-early serious Noreaster with a TON of snow (12-20 inches of powder fell in some spots, no snowplows, freezing rain, sleet in others) with my newly acquired 49 Kaiser with a really bad engine with incredible blowby (and a quart an hour oil loss out the tailpipe, no leaks) it was a learning, and bonding experience. Heater worked nicely, and I got used to the accelerate up the hills for 7 seconds, back-off for 2, accelerate for 7, etc to get the windshield clean in a howling blizzard going uphill.
Seriously, I was wondering if you could post the instructions here, or even possibly send me a PM to me so that I can have a copy of it. I have a lot of parts on hand and would like to try installing a vacuum rear window wiper (as well as a 6 V Trico aftermarket fan I have, as a "defroster") in my 49 sometime