They are engine tie downs ( hope the link works) https://www.facebook.com/groups/674536985902802/permalink/6646120108744430/?sale_post_id=6646120108744430
65 SD Convertible
Look like you have to join the group to see the post.
Is it one set or just for one side ?
https://canadianponcho.activeboard.com/t63333628/click-here-to-support-canadian-poncho/
1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles
1966 Grande Parisienne, 396 1 of 23 factory air cars (now converted to a "factory" 4 speed)