The steering wheel was the same from 1950 to 1955, but the horn button changed in 1952 to a black background (was white). These aren't too hard to track down. There is a pretty tatty one on The Samba at the moment for US$80, or for the best you can buy there is Kochs (
Kochs linky)
The tail lights depends on when it was made. Prior to October 1952 it will have the round tail lights and after October it will have the heart tail lights. Rounds go for approx. US$800 and the hearts are around US$600. Try The Samba for these too, there are usually hearts for sale. Rounds are a bit harder to come by.
Easiest way to tell which type your car needs is if the window rubbers have chrome strips in them or if the speedo is right in front of the steering wheel, then you need the hearts. If you are really keen you can tell by the chassis number.
A 52 is a rare car over here, have you got any pikkies??