I just found these on EBAY. If I buy these, I shouldn't need any special tool right? Shouldn't they just be a straight swap of whats currently there? I can't just go out and look b/c the cars currently being stored at my parents.

http://cgi.ebay.com/ebaymotors/Mercedes-Lower-Ball-Joint-SET-W140-S420-S500-400SE-SEL_W0QQitemZ370027869438QQcmdZViewItem?hash=item370027869438