That old sickle bar most likely has individual blades riveted onto a bar. The blades are kind of triangular shaped about 2 inches across. I’m certainnyou v
can still buy them from a tractor supply. The tivets are soft steel cold rivets. Just make sure you get the right lenght.
Forget new skin, Crazy Glue is way better. Crazy Glue should be part of every first aid kit.