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I did this in a 444 which I converted to B18, 12V, d-type OD, back in (jeez!) 1976!
I got a 12volt 544 wiper motor and bracket. The car is in Cazadero, CA and I'm in NYC so I can't show you pix or go look at it to refresh my memory, and this was some time ago. I do remember that I had to cut the mounting bracket (I think I used the 544 bracket - it has the proper holes for rubber isolation grommets etc., and will bolt up to the body same as 444 bracket) to allow for the unfettered movement of the the wiper arm linkage rods.
More importantly, as the 12volt motor is now mounted in a different position re: the rest position for a 444 - I had to modify the crank/clamp with the 2 pivots that bolts onto the motor. I may have had to grind off and braze them back in this new relationship. It worked very well.
This is all necessary because of the difffernt wiping methods:
444 - from the center out in opposite directions, flat glass, driven on outboard side of windshield - much longer linkage arms -
544 - they wave together in same direction - driver's side from outboard side, passenger's side from near center.
Thus the linkage rods have to move differently, and the necessity to change the relationship of the pivot points on the motor crank. Get the motor mounted, attach the arms to the wipers, and you'll see how you have to alter the crank.
I believe that I mounted a 12v 544 wiper switch in the hole under the 444 heater control where the vacuum switch had been - or I may just have let it dangle under the dash in the center near the motor.
I hope this is clear if not ask me questions and I'll try and clarify.
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