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It would be better to find a '51 - '52 wiper assembly since it is one piece. Too bad I sold my spare to Vern aka Greatnorthwoods. Maybe you could barter with him for it.
The one thing you will want to concider is that the '51-52 wiper will not fit in a '48-50 dash with a '48-50 stock radio. I had to alter the wiper to fit over the dash, in the original location, and make a linkage to the right side to clear the radio.
It's been a while since I did the work but I'll try to take some pictures and post them. It may take a while because I have a couple of projects that have to get out of the shop. Work before pleasure.
I have 1 or 2 51-52 linkages left here. If you want one to make that right hand link, I'll sell one cheap. I know I have one that just linkage, no motor on it.