Here is an example, and one for sale.
https://www.ihccw.com/sleevehitch.html?product_id=11632
I've bought from IHCCW many times. Guy knows his stuff. He has this part listed to only fit the 1100, 482 and 582S.
I'm pretty confident about my position...... That part is designed to bolt to the Peerless rear end.
EDITED NOTE:
It would also fit the 1604.