differential to control arm bushing??

It's exactly the same. I just installed one on my 7.5 diff that was listed for both a 7.5 and 8.8, went on perfectly. Here's a link to what I bought:

http://www.maximummotorsports.com/urethane_rear.asp

I also recommend buying the tool to remove the old and install the new one:

http://www.maximummotorsports.com/rucabushing.asp

It made removal and installation a breeze.