1963 trans filter

I have a 63 valiant 225 w/904 push button auto. This car came factory with exterior filter for the trans, don't have a part #, what can I do about this problem? I have blowed the front seal and need to repair. I thought of another hydrolic inline filter but I am afaird to restrict flow w/the wrong filter. Any help would be appreciated, miss driving my little 63. :notworth: