Ive replaced both door switches in my '65 Deluxe (one was bent in half!).
It has the small alloy switches with LINREAD stamped on them that sounds like the same units they used until the later screw in type.
The switches have an elbow inside the A pillar where the earthing wire is bullet connected and its all inside the A pillar. Be carefull removing the switch and make sure you dont pull the wire out of the elbow as if you loose it inside the A pillar you will have a hard time trying to get it out again via the small hole - done it before with bent paperclips - but avoid loosing the wire inside - life is easier that way

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I got NOS handbreak switches from a mini spares place (apparently they are parts for a warning switch on Cooper/1275LS handbreak levers...!?) All I needed to do was swap over the existing elbows as the new switch units had a striaght through connection that wont fit inside the A pillar. It was very easy with a pair of pliers and a bench vice and a small hammer to reshape any distortion in the curled over elbow flange.
I was after a totaly original look and doing this cost me the grand total of $10 ($5 per switch).
All these little things seem to me like a great excuse for a Technical Day somewhere.......