Macybaby is the person for attachments and probably has all the templates that Singer/Greist ever produced.
Going slightly off topic a bit, I think these would be really easy to copy, just by making a mould and making from thermosetting plastic (the old fashioned way) or you could scan and 3-D print them from whatever you like.
I have only the ones you have except the elusive round one, but the template buttonholer is my favourite attachment.