If you haven't noticed any noises coming from the mounts, and you have factory ones on there, I'd recommend keeping them unless you spring for factory mounts. The aftermarket ones are all pretty crappy. KYB (not recommended) and Sachs struts don't come with bump stops, so if yours are falling apart as mine were, you will need to replace them. Check out Rockauto for those. I ordered a pair of Rein bump stops, which were actually made in Germany, for just a few bucks each. They're not identical to the factory ones, but they're extremely similar. There were bits of the foam bump stops all over my struts because they were starting to disintegrate from the inside out.