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Don't think I'll worry about the door lock...The old farmer that owned this truck before had his keys brazed to a pocket knife. Instead of pulling out a blade, you pulled out the key. Kinda ingenious, in an Okie kinda way.
Look on www.fordbarn.com and there's a guy from Southington, Conn. ( near me ) that has them for sale. Look on the early V8 side of the site. You may have to scroll down a little for his ads.
If the 51 switch is the same, you are welcome to the old one I took out of my truck. Someone else was looking for one awhile back and I sent them a picture, but they said it was the wrong one. I don't have a key though so you would have to get one made at a lock shop.