Aahh..I see, so they are all four in the front. One is just the rear of the front!

I am replacing most of the rubber on my car. I've already done the motor mounts, motor shocks, and tranny mount and I've got the rear subframe mounts and diff mount sitting in my garage, just haven't tackled that one yet. Do you think I should replace these too?
Also, what do you know about the diff mount? I got that one that is kinda U-shaped, rear one I guess. Is there another diff mount maybe in the front of the diff that needs replacing also? The manual showed something else, I think they called it a bushing. I'm not really sure...