Freelander 1 Annoying rubber sound from behind

Hi,

I had very annoying rubber sound that comes from behind, on uneven roads.
I changed the front diff mount which has a broken rubber, it solve the issue for 2 days
And now the sound came back but less than before.
I looked again at rear mounts, the rubber part looks very old and feel soft, and it make the same sound when trying to move them by hand.
My question was, should I keep an eye on them and wait until when they start to fail to change them ?

Also when I was under the car I see that the left rear axle is greasy

Also when I was under the car I see that the axle is greasy …