It depends on the vintage of your .32. We'll need a serial 3 or partial #.
the two main issues are:
1. pre or post war gun to match the hammer safety block? and
2. in post war models, leaf or coil mainspring?
You have lot's of potential hammers that interchange with yours:
I and J frame .32s, 38 S&Ws and .38 S&W Special
Numeric is the easiest way to get one if they have it, once we know which vintage you need.