Here's what I found in my 1929-51 parts book, looks like you need a locking handle and the internal lock assembly to make it work.
16.330 Lock 1939-42...ALL...right, front door (jobs with locking handle)...3658536.
16.350 Handle Assembly, Door, Lock Outside (w/cyl. and two keeys) 1939-42...ALL...side, R.H. (coded8000 to 9499 incl.)...3654633.
Hope this helps,
Mike B
