If they are the original lines, I would replace them anyways. Then see the difference in price. I have them on my DD and enjoy the firmer feel. The also look nice underneath as I have the UUC ones, which are teflon coated blue. The rubber over time has stretched from expanding as fluid moves thru it.
If you can afford it, do it. You will still need to do the hard work of getting them out by the diff, and it can be a pain.