Just change it all out, do you really want to go back in and do the job twice over something that youll be taking off anyway? Sachs is OE to many many manufacturers, Id trust them as an OE quality product over any of the others besides Genuine. Ive had issues at my shop with Moog and Monroe, Im mostly European so maybe its different for American, but I wont trust them again. I had to do a ball joint 3 times under 1 year warranty that was supposedly Moogs "Heavy duty" I went to a Febi balljoint and its been fine for 5 years