Due to returning problems with 5 LHM pumps in my ID/DS I decided a while ago to get a CX pump, make it fit the ID/DS and replace the previous original ID/DS pump.
The problem with any original pump is that they all leak. Not during driving, but after a while, in the garage or in the parking lot. I had 3 overhauled pumps from the larger suppliers but thay all shared this problem. Not a lot of leakage but enough to get me in trouble in my parking garage.
On top of this, new MOT ruling is that a car, also old cars, may not leak any fluid. So, it was coming anyway.
I had a LHM pump available, from one of the first CX series and this is what I did: