Sorry, don’t know one.
Why am I still answering: in worst case, you can try to copy the drawer of the AmiDock application to your 3.2.1 disk.
Then, on your 3.2.1 system, start SnoopDOS and then the AmiDock executable. SnoopDOS will show what components are missing.
I would expect you need ClassAct/ReAction. See here for example how to get it also from the OS3.9 CD: