Hi, I just bought a 1992 Ford Explorer and when I brake or hit a hard bump it really makes a loud clunk sound... the po said it was in need of a radius arm bushing. I have never installed one of these? Is it hard to do? Is there a difference in what brand I should buy? I see schucks has some for $13.99 I can pick up today and from there they go all the way up to $41.99. Thanks for your help.