Replacing Terminals on RM4300SAT

Hi,

Not sure if this is the correct category, but it seemed a good place to start.

I have an RM7600 set and one of the satellites took a tumble and the stress broke off one of the terminal binding posts. I would like to replace the post but was unable to find an exact replacement (Any idea where I can get one?).

I got a similar post from ebay and attempted to replace it, but was unable to remove housing the terminals are mounted to. What is the trick to getting this off beyond the obvious screws?

Thanks!