Trailing arm bushing

[Albertothe16]

Hello I have a 2005 Subaru legacy, I am trying to replace the rear lower control arm on my car but I have a problem right now, the bushing on the trailing arm where the lower control arm is connected it is busted so I'm trying to find out those bushings aftermarket because the dealer sells the whole arm. If someone can help me with that thanks.
I leave some pictures of the part