You need a hardware kit for '68 and earlier. Or, it can be made to work with '69 and up kits with the matching '69 and up brake shoes.
The '69 up adjusters are the opposite of the earlier ones and the '69 and up self adjusters use a pin that gets pressed into the shoe's frame.
Even though yours is a '65, many parts catalogs lump them all together, so you need to be on the look out so you get the right ones to match your setup.
A few pictures showing the adjusters in the 1964 Brakes MTSC, Brake Service (Session 204) from the Master Technician's Service Conference
1969 self adjuster shown on this page: Drum Brake Service Highlights (Session 260) from the Master Technician's Service Conference
