As far as I know from when I bought a pitman arm, all they come with is a cheap piece of felt, not rubber like the original. This is a maybe, maybe not type of fix, but if the damage is not too bad, clean the the rubber thoroughly with Rubbing Alcohol and repair with black automotive GOOP. Let it cure completely and it
MAY work. I did one like this and it's still in the car.
As far as fixing the sector shaft leak is concerned, read the recent post by
@The Heff on rebuilding a PS box.
I might suggest searching previous threads on repairing or rebuilding PS boxes by my Guru, Bentworker. He is very knowledgeable and largely responsible for my own experience fixing my own boxes.