Ours have leaks and I need to replace.........

 

Nothing special really. You will need a bottle or so of ATF to replace what drains out. They say to replace the O-rings, but mine didnt have any. Other than that, just unscrew (which can be difficult...PB Blaster) and screw the new ones on.

On mine, the two that connect to the cooler bar on the front were rusted out, so I changed those. I did not replace the one that goes from the tranny to the lower radiator. It is covered in oil, so it didnt corrode. Also, I couldnt figure out how to get to the part that screws into the tranny...tight in there

I got the set of 3 from roverbones for about $90.

 

You have one other option that is available to anyone living in an area that has a lot of industrial hydraulic/pneumatic equipment places like most major cities do. There are a lot of those types of shops that will make replacements.

There is one near me going into the industrial areas of Pittsburgh that will reproduce items like that with while you wait if you bring the items in. They advertise one hour service on most types of hoses and similar equipment.

In my opinion a high quality industrial type replacement beats salvaged ones anyday.
Would not hurt to check it out.

 

Pay to have them replaced.
There is a thread in the general tech section, a guy just replaced his, he said it took longer than expected and was more difficult than expected.