Caster Camber kit?

Hey guys, I went to get an alignment and the mechanic said I need to replace the caster camber kit. I knew there was a problems because the front end has a clunk when I go over bumps sometimes but he wants 620 to replace the caster camber kit...
I was just curious as to whether this is a caster camber kit or if I need anything else since I don't know much about suspension.
http://www.americanmuscle.com/srperformance-caster-camber-9404.html

Sorry, it is a 2000 Mustang. I replaced the lower ball joints and inner and outer tie rods myself but I haven't touched the struts. I am going to take it to another mechanic to get it checked out but at this point I think I am gonna go buy a 2013 since now a pulley is squealing too after changing the belt and this is a salvaged vehicle.... And yea I asked him how much he was charging for labor and he said something like 220 so if that is the correct part he is shafting me on the parts. If I posted a picture of the part on the car would that help? I have not take anything apart as it is my only daily driver.