Replace 1 bushing, or everything?

Just an update on the progress, I'll probably just turn this into a suspension rebuild thread. Got the old leaf springs off the back, the shackles and shackle bushings were quite new so I think I'll reuse those. U-bolts look like they're in good shape too so I'll probably reuse them. Since the car will be up for a while as I work on the front, I'm going to get some good black paint and paint the spring hangers and plates while they're off the car.

The rear leaf spring hangers (that the shackles hang from) look pretty worn out and the cylinder part is split open. I found new ones on Mancini but if that's the price for a single bracket I need to look somewhere cheaper! Is it even worth replacing them?